I recently bought a 1960 Tbird, which had a incomplete bumper jack assembly. Question: is the assembly different for the '60 vs the '58 & '59? Also, the base plate stamped with AJ-C on one side and A on the opposite side which doesn't allow me to secure the spare to the mounting bracket. The one piece threaded L-shaped attaching bolt appears to be correct. The post is 33 1/2 long, the ratchet is 1 1/2 inches where the j-hook is attached. What have I got and what do I need ??? Thanks. This is my first post as a "newbie".