I have a 93, same setup. Looks like they added longer studs to accomodate the DRW thus the need for the collar/spacer. We will have to keep in touch I thought I was the only guy in the world with this Centurion conversion.
Ever checked your rear brakes? Have a brake problem and wanted to get the drums off. Can't seem to loosen the nuts holding the individual stud spacers. Got a little nervous as I didn't want to twist a stud off. Thats the trouble with conversions. Information can be alittle tought to come by.