8.25 Centre and Sure Grip issues

I clearanced my housing like the picture showed, and it STILL wouldn't fit. I finally gave up and installed the open carrier so I could get my car back on the road. There is something different about them, for sure, although I still have mine. I don't think machining a spacer is going to work, because of the axle fitment issue above. If they're all the same, I can't figure out why this won't work, UNLESS its coming from an 8.25 front diff, in which case, there may be a different fitment for those. I had intended to try to install this in a Dakota 8.25 rear housing just to see if it would work, but haven't gotten around to it yet. I know that an open carrier out of a dakota 8.25 will fit our a body 8.25 just fine, because that's what I used.