LBP 10 x 1 3/4 brake drum availability?

i have a question. if it is an 8.25 rear end with 10 inch backing plates and lbp,
why couldnt you just keep the drums and put the correct 2 1/2 inch brake shoes on it. isnt the brake hardware the same? then you wouldnt have to hunting for drums?

8.25's were all large bolt pattern. A bodies didnt use them until 1973 and an 8.25 rear meant disc front.