68 GTX Rear Axle Bearing Help

Is there a way to identify what kind of rear it is? Someone else installed it in the early 80’s. As I said not familiar with Chrysler rear ends. Thanks Mike

Look at the casting numbers on the lower driver side or the cast section. The last 3 digits denote the 3rd member. 741,742, 489 for 8 3/4 rear ends. The 8 3/4 has a round, no bolt rear cover welded to the axle housing.