Rear Bumper

[Patch]

Howdy all.....bought a rear bumper off of my friends 67 shorty today.....my 72 had a POS aftermarket bumper that now lies in the scrap pile. My question is......The dust shields that mount to the frame and bumper brackets aligned perfectly on the 67, but on my blazer they dont. The outter brackets are the same for the Blazer and truck aren't they? I pulled off the inner brackets as the Blazer doesn't need them......The difference in height is about an inch or so......any ideas? Thanks!