Rear Bumper Bracket Issues

[Senorx]

I finally got around to removing the rear roll pan the PO had on my K5. I ordered some aftermarket brackets and a gravel guards from GMCPaul's. Bolted up the brackets, which took longer than I expected because of the tight spaces. I had to unbolt the gas tank skid plate too.

The brackets seem off. The outer brackets seem to long. The inner "L" brackets don't even make contact when I tried to mock up the bumper for figment purposes. The bumper makes contact with the body so the outer brackets are able to bolt on.

Another weird thing is the gravel guard holes only line up with inner "L" brackets and not the outer brackets.

Are these the wrong brackets or am I just a newbie dumbass who can't figure out this simple task?