in too deep: trying to go BBP on a 68 barracuda and its going.. poorly.

on measuring backing plates to determine what size shoes go on it, oldkimmer gave me these dimensions some time ago. so far it has worked for me. lay backing plate on bench, face up. you will have to let the gig dimple on rear hang off bench, so the backing plate rests on the rear lip. measure down to the bench thru the center hole and if measurement is 1.5 inches=11x2. if 1.75 inches=11x2.5. if 2 inches=11x3. credit oldkimmer for this. i will take pics later to show how i do it.