uuuuuuuuuhhhhhhhhh..........what brackets?
1st generation rear discs prior to '94 don't make use of a bracket, the caliper is fastened directly to the rear knuckle casting...sooooooooo what have you got there?
I am not sure who this might help, and I know I am bringing up a dead thread, but I found a better fitting alternative to what Twilks said. I found another Dorman brand PCV grommet that is part number 42346. It fits snugly in the pipe and does not require near as much force to install. This is coming from a owner of a 3400 Grand Am.