Tha build sheet calls out the wheels and separatley the spare, so you could have ordered what ever you wanted, full size ot the space saver in 70 Cudas. as i know my build sheet has them listed separatley.
so the size of the rod does not ensure which wheels came on the car. and the 70s should be BF goodrich tire not good year.
see line 4 ,8 boxes to the right