SPROCKET FOR POWER SAWS COMPATIBLE WITH MODEL: 254 after S/N 345-000 257 after S/N 314-0001 262XP after S/N 345-0001 BELL INDEX: 68.5mm BORE INDEX: 16 mm TOTAL HEIGHT: 29mm .325" 7 TEETH roller cage: 11893 self-aligning ring: / HUSQVARNA CODE: 100758X ORIGINAL CODE: AT