Backing plate offset

Here is a thread that gives the real world numbers on the backing plate measurements. "35/64 or 0.5468 of an inch" http://www.forabodiesonly.com/mopar/showthread.php?t=284979

The second issue is going to be the hub is way too small "if it was manufactured to the OEM size" to use with the modern 10" lbp drums. One member has a special ring that he made or had made to correct this problem.

Since the backing plate difference is 0.5468" and the lbp drum difference is .75", that is something that would have to be carefully looked at.