HEAVY DUTY ENGINE AIR FILTER REPLACEMENT - This air filter is a direct replacement for many RVs, buses, motorhomes, medium-duty and heavy-duty trucks, construction equipment, and agricultural machinery. Built to withstand demanding environments, it ensures clean airflow and reliable engine protection. Always confirm the filter number required for your vehicle or equipment. FREIGHTLINER WORKHORSE ENGINE AIR FILTER REPLACEMENT - This air filter is designed to fit selected Freightliner Workhorse chassis vehicles from 2001 to 2012. Commonly found in RVs, step vans, delivery trucks, and other specialty vehicles built on this chassis. Please verify the required filter number before purchase. SPARTAN, AMERICAN COACH & OTHER CHASSIS - This air filter is also used in Spartan Summit and Mountain Master chassis, American Coach Eagle Fleetwood RVs, and certain Eldorado buses and Workhorse commercial applications. Compatible with various diesel-powered platforms using similar engine configurations. Always confirm compatibility with your existing filter. MASSEY FERGUSON 250 & MASSEY FERGUSON 30 - This filter will fit selected Messey Ferguson 250 tractors and selected Messey Ferguson 30 construction equipment. It is used in various industrial and agricultural applications requiring this filter type. Please confirm compatibility by checking the existing filter number. INTERCHANGEABLE FILTER NUMBERS: Farr 062891001, Baldwin PA-2721, Donaldson P537447, Luber Finer LAF1828, Fleetguard AH8501, Purolator AF2267, Fram CA7229, BIG A 94891, Canadian Filter CFM4001, CarQuest 88891, NAPA 6891, WIX 46891 QUALITY & SIZE - Ampler Filters are designed for quality and reliability. All the filters are built with the industry standards to ensure engine protection and performance. The filter’s dimensions and specifications are precise to match the manufacturer. This engine air filter is a direct replacement for selected Freightliner Workhorse trucks, RVs, and other medium-duty and heavy-duty trucks’ engines. It is a high-quality filter built to meet manufacturer specifications.