HIPA RK-21HS Carburetor Repair Kits for STIHL 041 045 051 056 041 Farm Boss 041AVS 041AVQ 045AV 051AVE 056AV TS50 TS510 TS760 076AVEQ Chainsaw Replacement manufacturer part number: RK-21HS Fits Tillotson HS-60C HS-60D HS-60E HS-62B HS-87A HS-100A HS-138A HS-138B HS-262B HS-189B HS-212A HS-212B HS-221A HS-221B HS-223A