8 3/4 Shock Mount Plates
any car with an 8.25 or 8.75 will have the correct shock mount plates, the ones on my 65 barracuda w/8.25 came off a 1965 Coronet with an 8.75.
i had a hard time finding them, but went to enuff pick and pulls to finally get the ones i wanted.
good luck.
sb