15-25 Ford F-150 Westin 21-3945 SuperCrew Platinum 4 Oval Nerf Step Bars - Black

Boost style and functionality with these heavy-duty, OE-style 4" oval step bars. Built for durability and easy access, they offer no-drill installation and strong rocker panel protection for Ford SuperCrew trucks.

Top Features:

  • 4″ wide recessed step pads

  • Black powder-coated steel

  • No-drill bolt-on installation

  • Mandrel-bent oval tube design

  • Mounting kit included

  • Protects rocker panels

Vehicle Fitment:

  • 2015–2025 Ford F-150 SuperCrew Cab

  • 2022–2025 Ford F-150 Lightning SuperCrew Cab

  • 2017–2025 Ford F-250 Super Duty Crew Cab

  • 2017–2025 Ford F-350 Super Duty Crew Cab

  • 2017–2025 Ford F-450/F-550 Super Duty Crew Cab & Cab Chassis

Vendor: Westin
SKU: WES21-3945
Availability: (Special Order Item)
$ 503.75 USD
On-Sale $ 503.75 USD
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UPC: 707742064375
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Proposition65 Warning: Cancer and Reproductive Harm

Westin Platinum 4 Oval Nerf Step Bars – Part #21-3945

This heavy-duty step bar set is designed to elevate both the look and functionality of compatible Ford trucks. With OE-inspired styling and a recessed 4‑inch wide polymer step pad, these bars offer solid footing and protect rocker panels from road debris. No-drill, bolt-on installation ensures a clean fit, enhancing the truck’s appeal while delivering reliable performance on and off the road.

Key Features

  • OE-style 4″ oval tube with mandrel bends for superior strength

  • 4″ wide recessed polymer step pad for confident footing

  • Full-length vehicle-specific design enhances B-pillar protection

  • Mounting kit included; no drilling required on most models

  • Black powder-coat finish resists corrosion and abrasion

  • Mandrel-welded end caps ensure structural integrity

Benefits

  • Enhances ease of access to cab and bed for all vehicle occupants

  • Safeguards rocker panels from impact and road debris

  • Vehicle-specific brackets guarantee perfect alignment

  • Durable powder-coat finish delivers long-lasting appearance

  • Peace of mind with a 3-year warranty on black finish

  • Polished stainless option carries a lifetime warranty, catering to varied preferences

  • Warranty covers defects in materials and workmanship (excludes damage from misuse, road hazards)

Product Specs

  • Size: 4″ oval tubes, 4″ step pad width

  • Finish: Black powder-coated e-coated steel

  • Material: E-coated steel tubing

  • Warranty: 3 years (black); lifetime (polished stainless upgrade) Mounting: Vehicle-specific bolt-on hardware

  • Installation: No drilling required on most vehicles

Install Difficulty Level

Installation is straightforward and user-friendly. Most owners report a completion time of 30–60 minutes for the full set. This makes it an easy weekend upgrade with basic tools.

Vehicle Fitment

Designed specifically for the following vehicles:

  • 2015–2025 Ford F-150 SuperCrew Cab Pickup

  • 2022–2025 Ford F-150 Lightning SuperCrew Cab Pickup

  • 2017–2025 Ford F-250, F-350, F-450, and F-550 Super Duty Crew Cab Pickups/Chassis with compatible engine options

Vehicle fit is accurate and ensured by Westin’s vehicle-specific bracket system.

For questions or to report inaccuracies in this product description, contact the MPT Performance experts at (407) 636‑7077 or by email.

Shipping Policy

MPT is proud to offer free shipping on most orders over $149.

  • Free shipping applies only to the contiguous United States. Shipping and handling charges will apply to orders outside the contiguous US, and the buyer is responsible for any duty fees or taxes their home country may charge to import goods.
  • With free shipping, we will choose the best shipping method for your order. We use all major carriers, including USPS, FedEx, UPS, and DHL.

Turnaround Times:

  • MPT Tunes have a standard turnaround time of 2-3 business days, beginning once we receive your MPT Tune Form.
  • We do not process orders on weekends or observed holidays, which do not count as business days.
  • Physical items that are in stock at MPT and ordered by 4PM EST will be shipped the same day. Orders placed after 4PM EST will be processed on the following business day.

Special Considerations:

  • Items not stocked at our location will follow the same processing times but may experience lead-time delays and could incur additional charges. Shipping methods may vary for these items based on what was paid and the requested delivery speed. If you need an item by a specific deadline, please contact an MPT Expert.
  • SCT Tuner Orders with the Prioritized Order option must have their tune forms submitted by 3PM EST to be completed the same day. Forms submitted after this time will be processed the next business day.
  • Orders will ship to the billing address listed on your order. If paying by credit or debit card, we can only ship to the billing address. Contact an MPT Expert for assistance if you need a different shipping address.

MPT Performance Returns and Refund Policy

A Return Authorization Number is required for all returns. Please contact an MPT Expert to obtain an RA # before sending anything back to us for any reason.

MPT tuning charges and license fees are Non-Refundable. The sale is final when MPT has sent the tune file over email. This includes both new tune purchases and tune updates.

Products other than MPT tunes, digital products, and MPT decals may be returned within 30 days for any reason, provided that the product has not been installed and is in brand new, unused condition with the original packaging. Once a product has been installed it is non-refundable. We reserve the right to deny the return, should the product be received and it display signs of installation or unmentioned damage.

For vehicle programmers/tuners, the vehicle must be returned to stock if a program was installed. If a tuning device is returned and has not been returned to stock, a refund will not be issued, and your tuner will not be sent back without a shipping and handling fee.

The customer is responsible for all shipping charges incurred during the return process.

Amount Refunded:
•Returns post marked before 30 days from the date the item was received will be refunded the purchase price, minus a 25% restocking fee and the cost of shipping.
After 30 days, all sales are Final.
•Shipping charges along with any package insurance are non-refundable. If your purchase was shipped with our Free Shipping option, the cost of the shipping will be subtracted from the total refund amount.

HP Tuners Credits are assigned to the HP Tuners product with the submitted serial number and cannot be transferred. Once you load a tune to your vehicle with the RTD, these credits are Non-Refundable.

Digital products and files that have no ability to be taken back physically, such as an SCT Tuner Unlock, are Non-Refundable.

nGauge Tune License Fee is included in your initial purchase of MPT tunes for the nGauge. This fee is factored into the price of the tunes and becomes Non-Refundable when the stock file has been emailed to MPT.

MPT Decals are Non-Refundable, once they have been received by the customer.

Year Make Model Submodel
2015-2024 Ford F-150 King Ranch
2015-2024 Ford F-150 Lariat
2016-2023 Ford F-150 Limited
2015-2024 Ford F-150 Platinum
2018-2024 Ford F-150 Police Responder
2017-2024 Ford F-150 Raptor
2023-2024 Ford F-150 Raptor R
2016-2024 Ford F-150 SSV
2024 Ford F-150 STX
2021-2024 Ford F-150 Tremor
2015-2024 Ford F-150 XL
2015-2024 Ford F-150 XLT
2024 Ford F-150 Lightning Flash
2022-2024 Ford F-150 Lightning Lariat
2022-2024 Ford F-150 Lightning Platinum
2022-2024 Ford F-150 Lightning Pro
2023-2024 Ford F-150 Lightning Pro SSV
2022-2024 Ford F-150 Lightning XLT
2017-2024 Ford F-250 Super Duty King Ranch
2017-2024 Ford F-250 Super Duty Lariat
2018-2024 Ford F-250 Super Duty Limited
2017-2024 Ford F-250 Super Duty Platinum
2017-2024 Ford F-250 Super Duty XL
2017-2024 Ford F-250 Super Duty XLT
2017-2024 Ford F-350 Super Duty King Ranch
2017-2024 Ford F-350 Super Duty Lariat
2018-2024 Ford F-350 Super Duty Limited
2017-2024 Ford F-350 Super Duty Platinum
2017-2024 Ford F-350 Super Duty XL
2017-2024 Ford F-350 Super Duty XLT

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