This is right. I'm having Cass make up a set of axles for me right now that'll bolt right in using the stock brakes all except for the drums which I can re-drill.
Yes, that is an option if you want to stay with your old brakes, just redrill the drums. My SBP 10x1.75" drums were bad so I changed to the BBP 10x2.5". Moser can also make axles to work with your redrilled SBP brakes but you have to tell them what brakes you are using. Next time I will call Cass because his prices are lower and service is more personal with the work being done, but I will say that I am happy with the Moser axles after figuring out the spacer issue with some help from this forum and other people I talked to. In 1995 I bought the same exact Moser axles for $200 with bearings installed and put them in, never removing the diff spacer, and I remember the bearings being tight.
BBP brakes are wider (10x2.5" vs. 10x1.75"), so the backing plate goes deeper in toward the car to account for the brake width. Whichever drum you use needs to be mated with the correct depth backing plate. I think Mopar also made 10x2" but I am not sure which years/models, maybe someone can verify that.
