your o.k. and it's simple. 1963-72 A-bodys were small bolt pattern which is 5x4 bolt pattern and uses 7/16 studs. 1973 to 76 and most all other moparts in this 60's and 70's B-body, E-body and C-body used large bolt 5 x 4.5 bolt pattern and used 1/2 studs. When you do your conversion you will...