Hello.

The WCZ-H is the axle code. This one is for a rear axle assembly that came with a K code, the 3.50 is the axle ratio (3.50:1), which would have a code of 5 on the door tag, 5AB is the date code, which says the second week of january of 65. The 971 is the manufacturer's code, which doesn't really mean anything once the assembly is installed in a car.
