Hello if interested i know of a car in a local wrecking yard that has an original one still ( 72 ss chevelle )in it, that is for sale. You are correct there is a difference in them, the four speed one has an extra bracket welded to the back for shifter mounts.I live in Salinas, Ca and can arrange to ship it to you. I will need to see how much he wants for it, but i think that it would reasonable. Thanks, Geoff.