Air Filter Combo / Subaru 20A-32636-00Pack Size:1Ariens 21551200, Ariens 20020002, Subaru 20A-32636-00, Subaru 277-32606-18, Subaru 277-32611-07, Wacker 0156759Rotary 14648Subaru EX13, EX17, EX21, SP170 and SP210Width: 2 ", Length: 4 1/2 ", Height: 1 7/8 ", Pre-filter included