HIFROM TM Aftermarket AIR FILTER CLEANER Fit for Husqvarna 51 55 55 CHAINSAW NEW Replace # 503 89 81-01 1. New high quality aftermaket replacement parts 2. Fit for CHAINSAW 51 55 55 3. Repalce part #: 503 89 81-01 4. This is the Non original aftermarket part, Please check the sizes carefully before buy it. 5. HIFROM air filter from Professional Factory; Professional technical support; if you unsatisfy, can return no risk