This product is an inner air filter by Hastings, a cartridge style air filter made of cotton. It is designed for engine placement on vehicles, providing high performance. The manufacturer part number is AF2399-2, and it can replace part numbers 42845, RS3930, A2582C, 87845, and 2349828. It is not a vintage part and is not universally compatible. Made in the United Kingdom. Fits many gators X series, digger, and mower.