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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?

Don't know how important this was to the corrosion resistance, but I forgot to mention I primed mine with Rustoleum Cold Galvanizing Compound spray. It worked surprisingly well as a primer on bare metal. It never chipped, flaked, or peeled. I don't know if it's the same formula today as the one I used a couple decades ago. Photos looks like it's now a smooth gray primer appearance, but mine was a very sparkly shiny bright metallic silver color. Almost looked like fine very fine glitter. Still have the can and looks like it's the same can as the current product though, so who knows.

When I did brakes on my truck, I used black caliper paint, just to protect the calipers, center of rotors, and the rear drums. It's held up fine. Anything driven up here in the salt, the brakes usually start looking bad after just a year.

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.

final thought, if you use a 4t65 from an l36 or any 3x00 you can use the tq converter that come with it. if from an l67 youll need to swap tq converters as l67sone wont bolt to a 3x00