Genuine  product. Spacer fits up against the primary gear on the crankshaft and held on by the "C" washer 22A319 - both these parts wear as well as the gear. Now made 2 thou oversize to help correct wear issues.

Only fits cranks from 1962 on with 1.5" tail width-NOT the earlier 1.3/8" tail size. 0.164" plus or minus one thou.