67-69 Firebird and Camaros, 66, 67 nova will fit. You have to make sure you find one that has the same spring type as yours, as in mono or multi leaf. The only sure way to tell if its a possi is to pull the cover. I picked up my 12 bolt real cheep because the guy selling it didnt think it was a possi because both axles didnt turn the same way but it was just a wore out possi all I did was put in a new clutch pack and works good now If your rear end is in good shape and you just want to have a possi. I would just install a Powertrax No-Slip possi. Very simple.
