This fits Echo CS-400EVL, CS-440 EVL, CS-510 EVL, CS-3600, CS-3900, CS-4400, CS-5100 (after S/N 134504) John Deere 45
Replacement bearing included.
Check bar or sprocket for info to confirm if you have .325 pitch like this sprocket.
.325 pitch 7 tooth crank shaft diameter is 0.3937
Part# for additional bearing is 37509