NO --- they are NOT the same backing plates..... Some people do an " upgrade " to the 11 " x 2 1 / 2 " Rear Brakes, but keep in mind.....
Your car is equipped with 11 " x 2 3/4 " Fronts and 11 " x 2 " Rears.....
Cars that have 11 " x 2 1/2 " Rear Brakes
Are equipped with 11 " x 3 " Fronts and 11 " x 2 1/2 " Rears......
To do that " upgrade " , you must procure 11 " x 2 1/2 " Backing Plates....
If you " upgrade " the Rears without doing anything to the Fronts, you will " have too much Rear compared to the Front " .......
Sometimes, the old line / adage applies : " If it ain't broke , don't fix it " .......
Here is the Great News :!!! : I have *** N.O.S. *** U.S.A. made *** Rear 11 " x 2 " Brake Drums & *** N.O.S. *** Asbestos *** 11 " x 2 " Rear Brake Shoes ---
For Nice, Soft, Smooooooth braking and not ripping up Brake Drums to smithereens!!!!
Hallelujah, your Prayers are answered!!!!
P.M. me , as per forum rules, if interested....Craig.....