11" Brakes

I bought an 8.75 rear axle from a 1969 C body car. I believe the brakes are 11x2. Can I use the original backing plates and convert to 11 x 2.5 shoes and drums. Any help please.

Tim
I wondered this my self. I believe the backing plate dictates what size brakes can be used. It’s my understanding that the recess is deeper but not 100% sure. @hemi71x might have the answer though.

Jake