ID Rear End / brakes

[Perpendicular]

My 68 came with a 5 lug already done - which is GREAT for me - but I cannot figure out what it came from. I want to redo the rear brakes and figuring out what it is and what I need to order has been a challenge.

It is a 5x5 lug
11" across the pads
2 3/4" wide pads

I see where you can buy 11x2 for many GM trucks, but it seems like the 2 3/4 would not float around and be better.

Anyone have any advice or thoughts?

Thanks!

-Paul