[A1971Blazer]

The two short "L" brackets mount on top of the frame, the longer brackets mount to the outer most hole in the bumper and back to the frame....these two are side specific....make sure the angle matches the angle of the bumper where it attaches. Leave all the bolts semi-loose until they are all in.

I just mounted a new bumper on my '70 Blazer yesterday....... someone had mixed up the brackets and just left the bolts loose...I corrected the brackets and it mounted perfectly....