8" Truck Rally's on a 67

[jons70]

I don't know if I'm posting in the right place, but I have a problem with trying to put 15x8 truck rally's on the rear of my 67 C10. Someone has converted my truck to front disc brakes and 5x5 wheel lugs. The front appears to be a kit from LMC Truck using the 71-72 style 5 bolt discs. The rear however has been modified. It appears that someone has removed the rear axles from the diff and has had the original 6 bolt holes welded up, then re-drilled with new holes to suite the 5x5 bolt pattern. They appear to have used new drums also off of a newer truck. My problem is the center hub on the end of the axle shaft is larger than the center hole on my 15x8 truck rally's. The wheel will not fit up tight to the brake drum. Just a rough measurement with a tape measure shows me the hub on the truck is approximately 3 1/16" and the rally wheel appears to only be 3". The other issue is that the wheel is in too far compared to front, so I need to use a wheel spacer to correct this. Using a wheel spacer may also correct my problem with the hub diameter. If I get one that fits my rally wheel correctly I could always have a machine shop machine out the bore on the spacer to match the hub on the truck. I guess what I'm getting at is, has anyone come across the same problem? If so what was the solution?

Thanks
Jon