Restore exhaust filtration performance with this premium Skyline aftermarket Cummins / PACCAR A055B959 / 5579371 / 4394579 / 2064075 DPF Replacement. This brand-new unit serves as a direct-fit alternative to high-traffic OEM part numbers A055B959, 5579371, 4394579, 2064075, A064B961, 5579371RX, 5579371NX, 4394579NX, 4394579RX, 2064075XS, and 2064075X. Engineered as an exact-fit replacement for medium-duty systems running Cummins B6.7, Cummins L9 8.9L, PACCAR PX-7, and PACCAR PX-9 engine platforms, this high-efficiency diesel particulate filter requires no exhaust system modifications for installation, carries zero core charge, and ships free within the continental United States.

Cummins / PACCAR A055B959 Cross Reference

How to Verify Your Unit: This direct-fit diesel particulate filter replaces exhaust components stamped with housing, casting, or manufacturing tags matching any of the interchangeable assembly numbers or supplier cross-references listed below:

Choose Your Kit Configuration

Select the setup from the product options above that best fits your shop's needs:

• Full Kit (Best Value): Includes (1) Brand-New Unit, (2) Original Equipment Quality installation gaskets (2871772), and (2) heavy-duty hardware clamps (5417471).
• DPF Only: Includes the replacement component only. Installation gaskets and clamps are not included.

Key Features & Specifications for Part A055B959 / 5579371 / 4394579

• Built in the USA: Designed, engineered, and manufactured in America.
• No Core Charge: Brand-new aftermarket diesel particulate filter component; eliminates core return hassle and freight delays.
• Exact-Fit™ Technical Dimensions: Engineered with OEM-matching technical specifications, pre-machined sensor ports, and rigid factory-spec hanger alignments for direct exhaust installation with zero modifications required.
• Substrate Performance Matrix: Advanced wall-flow precious metal core substrate ensures precise regeneration intervals and long-term diesel engine emission control.
• Industry-Leading Warranty: Backed by a 3-year unlimited mileage warranty on all Skyline aftermarket solutions.
• EPA Compliant: Meets federal emissions standards for legal installation.
• Free Shipping: Free ground shipping within the continental United States. Orders placed before 2:00 PM Eastern ship out the same business day.

Cummins / PACCAR Vehicle Fitment Guide

Direct alternative solution for commercial heavy-duty and medium-duty vehicles configured with compatible aftertreatment layouts from approximately 2017 to present models. Optimized for:

• Engine Platforms: Cummins B6.7 (6.7L Inline 6), Cummins L9 (8.9L Inline 6), PACCAR PX-7, and PACCAR PX-9 configurations running under active commercial fleet monitoring.
• Chassis Fitments: This specific physical layout maps securely to medium and heavy conventional chassis variants across major manufacturers:
  • Freightliner Platforms: Business Class M2 106, M2 112, 108SD, and 114SD platforms.
  • Peterbilt Platforms: Models 337, 348, 536, 537, and 548 configurations.
  • Kenworth Platforms: Equivalent Class 6, 7, and 8 commercial chassis indexing groups.
  • International & Western Star Platforms: Compatible medium-to-heavy delivery and vocational fleet vocational options.
  • Buses: High-traffic transit layouts and standard school bus configurations.

Compatible OEM Master Assembly Numbers: 4073475C93, 4073475C94, 4073475C95, 4073476C95, 4073478C92, 4073478C94, 4156276C92, 4156282C92, 4156298C91, 4387646, 4387647, 4394560, 4394721, 4394893, 4394918, 5418219, 5418221, 5506202, 5506203, 5506204, 5506205, 5506223, 5506224, 5506262, 5506264, 5506351, 5506513, 5506546, 5506547, 5506780, 5507265, 5508060, 5508062, 5508063, 5508064, 5508083, 5508086, 5508091, 5508092, 5508093, 5508094, 5508095, 5508096, 5508097, 5508098, 5508099, 5508100, 5508101, 5508146, 5508148, 5508219, 5508220, 5508221, 5508222, 5508224, 5508225, 5508226, 5508227, 5508229, 5508230, 5508231, 5508232, 5508238, 5508240, 5508242, 5508243, 5508244, 5508245, 5508248, 5508249, 5508250, 5508251, 5508252, 5508253, 5508254, 5508256, 5508257, 5508259, 5508261, 5508262, 5508263, 5508265, 5508269, 5508270, 5508271, 5508272, 5508273, 5508274, 5508275, 5508276, 5508699, 5508790, 5508791, 5508792, 5508793, 5508794, 5509169, 5509170, 5509171, A052T991, A054M323, A054M324, A054M339, A054M340, A054Z438, A055B039, A060H517, A060H518, A060H524, A060H525, A060H788, A060H791, A060J098, A060J099, A060J117, A060J549, A060J559, A060J563, A060J568, A060T081, A062J457, A062J768, A062K250, A062K252, A062K256, A062K257, A062K259, A062K262, A062K264, A062K267, A062K352, A062K631, A062K632, A062K633, A062K639, A062K640, A062K641, A062K642, A062K644, A062K646, A062K654, A062K701, A062K704, A062K705, A062K706, A062K707, A062K708, A062K709, A062K710, A062K713, A062K714, A062R492, A062R516, A062R581, A062X009, A062X010, A062X011, A062X012, A062X013, A062X014, A062X015, A062X016, A062X018, A062X019, A062X021, A062X023, A062X024, A062X025, A062X027, A062X031, A062X032, A062X033, A062X034, A062X035, A062X036, A062X037, A062X038, A063E989, A063E993, A063H679, A063H680, A063H681, A063H682, A063H683, A063N672, A063N673, A063N674

Signs Your Aftertreatment System Needs Replacement

• Frequent, unprompted, or incomplete diesel particulate filter regeneration cycles linked to active trouble codes matching A055B959 / 5579371 / 4394579
• Excessive particulate soot loading, filter face-plugging, or high differential exhaust backpressures
• Active dashboard diagnostic trouble codes (DTCs) signaling low soot capacity or catalyst substrate failures
• Unexplained commercial engine backpressure spikes or sudden power loss under heavy freight loading

*Note: Always verify exact vehicle compatibility using your vehicle's VIN number, emissions family descriptor tag, or the original stamped OEM part number on your filter unit casing before placing an order.

Disclaimer: Product images for reference only. Final replacement hardware items matching OEM parameters such as gaskets, clamps, and sensor ports depend on your kit configuration. Selecting the "Full Kit" option adds the explicitly listed installation components to your shipment. Price is for (1) DPF.