I have a rear set of, if I remember correctly, 69 Vista Cruiser drum brakes.
The shoes are 2 1/2". Same as the front. They require the VC backing plates to work.
I ran them on my 68 for a number of years but had issues with the rear brakes locking up before the front drums. During the restoration I toyed with the idea of using them with a front disk setup but decided to keep the original drums with Muscle Car Brake Shoes.
And IIRC the 73-77 A body wagons had 11" brakes along with a select few Monte Carlos. Again, OPH can confirm.
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Ed
1968 GTO (Thanks Mom)
2006 Silverado
2007 Cadillac SRX
2015 Chevy Express 
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