As most of you know what I have, I won't go into too much back story. I'll just list the necessary info:

Stock N90 5 Spoke 15" Wheels
Plain J65 Brake system F/R Disk

Here's the problem I'm running into, I'm not looking to upgrade, yet. But I do want to replace the rear disks. All I can ever find on anyplace is rear rotors and pads for the Performance Package. Since I don't have the 1LE, what rotor and pads do I use? And if I want to replace the calipers, what then?

 

1LE ("Performance package") doesn't matter. That's the fronts and only started in like 88. Doesn't apply to your car.

82-88 rear discs are all the same; 10" rotors, cast-iron calipers. 89-92 are all the same; 12" rotors, aluminum calipers. If this is for your 85, it's the cast-iron small-rotor system. And you may be right about having trouble finding them, in general: rear disc parts for both of these systems are getting harder to find all the time.

 

Thanks for the information and, yes, this is for my 85. That sticky about Brake Upgrade and Wheel Fitment did not have the information that you gave, unless I overlooked it. I saw quite a few ask about stock 15" but no responses. Lot of it was about Firebird fitments.