1970 Duster AlterKtion, 4 Link, LS/T56/Turbo and Minitub

TT5.9mag said
You can buy the aluminum alignment pucks and rod at summit.

The only thing about those, is they only go in the outside bearing retainer. I found a chunk of tube in the "up for dibs" pile at work that I'm going to turn down that fits in both of the rear end and the outer housing so its lined up. Should work!