This is a A-B1CT11 Chain Tensioners PN: B1CT11Main Description As Following : A-B1CT11 Chain Tensioners P.N: B1CT11 A-B1CT11 Chain Tensioners P.N: B1CT11 Crossed From: 50-145-27-01 HUSQVARNA , 50-145-27-02 HUSQVARNA , 50-145-41-01 HUSQVARNA , 50-154-63-01 HUSQVARNA , 501 45 27-01 HUSQVARNA , 501 45 27-02 HUSQVARNA , 501 45 41-01 HUSQVARNA , 501 54 63-01 HUSQVARNA , 501-45-27-01 HUSQVARNA , 501-45-27-02 HUSQVARNA , 501-45-41-01 HUSQVARNA , 501-54-63-01 HUSQVARNA , 5014527-01 HUSQVARNA , 5014527-02 HUSQVARNA , 501452701 HUSQVARNA , 501452702 HUSQVARNA , 5014541-01 HUSQVARNA , 501454101 HUSQVARNA , 5015463-01 HUSQVARNA , 501546301 HUSQVARNA Found in Section & Models : Sunbelt - Chainsaw & Forestry > Chainsaw Tools, Husqvarna CHAINSAW: 133, Husqvarna CHAINSAW: 234, Husqvarna CHAINSAW: 238, Husqvarna CHAINSAW: 242, Husqvarna CHAINSAW: 257, Husqvarna CHAINSAW: 262, Husqvarna CHAINSAW: 336, Husqvarna CHAINSAW: 340, Husqvarna CHAINSAW: 345, Husqvarna CHAINSAW: 44, Husqvarna CHAINSAW: 444, Husqvarna CHAINSAW: 50, Husqvarna CHAINSAW: 50 RANCHER, Husqvarna CHAINSAW: 51, Husqvarna CHAINSAW: 55 Associated Items : New Also This is An Aftermarket Product And : High Quality Afternaket Shipped from Both US and Canada