Air Filter / Stihl 4203 141 0301Pack Size:1Stihl 4203 141 0301Dealer Choice 15-1504, J. Thomas BR-324, Landscaper Express 4203141, Landscaper Pro 4203141, Mow More ST10963, NHC 218-9071, Oregon 30-137, Rotary 10963Stihl BR420, BR420C and BR340LWidth: 3 7/16 ", Length: 5 1/8 ", Height: 1 3/8 "