Rear Drum Question

You said "Years ago".About how long? At one time they were making big bolt pattern axles that were direct replacement using the 1.75'' shoes and backing plates. I bought 2 sets of axles from Mancini and did my Dart and my friends Duster.All we had to do was re-drill the drums for the pattern.They even had the small hub register.That was 20 years ago. I'm not sure when they stopped making those axles but now it looks like the only ones on the market have the 10''x 2.5'' backing plates and drums AKA "B'' body parts.So look at your 4''BP axles and the replacements to see if the hub register matches.If so you got the "old style axle" for lack of better wording.If not then you can use the 10''x 2.5'' or=
"Yes" on using the 11'' drums and matching backing plates as long as they are 11x2.5'' Chrysler also made 11x2" sets. I believe your brake cables will work as I've done several 11'' changeovers and used the cables over again.