Replacement Cylinder and Piston Assembly Kit For Husqvarna 545 545XP 550 550XP | eBay
Amazon.com: Pop Up Piston Kit Compatible with Husqvarna 550XP, 545XP MARK II Chainsaw 43mm Replaces Part # 582645602 Extra Power and Compression! Two Day Standard Shipping To All 50 States! : Patio,
Amazon.com: Compatible with Husqvarna 550, 545 Piston Kit 43MM Replaces Part # 577047002 TWO DAY STANDARD SHIPPING TO ALL 50 STATES! : Patio, Lawn & Garden