I just bought a good condition 87 Iroc and it has a real leather bra that says Irocz oon it. Is this a dealer bra???

I have never ever heard of a real leather bra for our cars. Are you sure it isn't vinyl? A bra was more likely an owner added item, though dealers can add anything there is on the market.

The GM bras I've seen/heard of haven't had any lettering... Unless it says 'GM' somewhere on it, its probably an aftermarket piece. I sold an "IrocZ" bra about a year ago, wasn't worth keeping.

No doubt made from the hide of the rare naugabeast.