OEM Husqvarna air filter cover kit which includes the air filter, air filter cover and wing bolt. The part number for the air filter is 537143101. The part number for the cover is 537066302. This kit will fit the Husqvarna trimmer models 326C, 326E, 326ES, 326HD60X, 326HD75X, 326HDA55, 326HE3, 326HE4, 326HS75, 326HS99, 326L, 326LDX, 326LS, 326LX, 326P4, 326P5, 326P5X, 326RJX, 326RX, 326SX, 327LDX, 327LX, 327PT5S, 327RDX, 327RJX, 327LDX