SPROCKET FOR CHAINSAW COMPATIBLE WITH MODEL: P34 P350 P360 P361 P370 P371 P390 P391 P411 BELL INDEX: 57mm BORE ID: 14mm TOTAL HEIGHT: 20. 5mm 3/8" (91) 6 TEETH roller cage: 37509 ALPINA - GGP - CASTELGARDEN STIGA - MOUNTFIELD CODE: 104102X ORIGINAL CODE: AT