Hy danzimbric, the offset for the 20" X 6.50" wheel is listed in my parts book as 5.75", hope that helps.
Thanks, I mounted a 20 x 8.75 the other day without and interference issues on the rear.
I found three 20 x 8.75 welded rims with locking rings locally and a fourth on craigslist under an add for a used tire. Two of them were painted olive drab so they may be off a military truck. I have seen several pictures of the 2-1/4t trucks with GMC 6 bolt wheels.
Now I'm only looking for two unicorns. I may have to bite the bullet and purchase a couple new ones from Wheels...Now. At least I found a source and the interesting thing is that don't list GMC or Chevrolet under the vehicles on their web site.
