Ok so I have a 9 bolt with pre 89 calipers (the ones that have the screw out parking brake) anyways providing I don't sell my car I will be trying to put the updated calipers on it and I was wondering if they would just bolt on to the old backing plate? Or do I need to find a backing plate made for the newer calipers? Any ideas? Thanks

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1988 IROC-Z T-Top "MATTSTOY"
350 Crate engine
370ft. lb Torque out of the box
5speed, Centerforce clutch, Spohn Sub-frames & adjustable pan hard rod, Jamex 1.5' Lowering springs, 2 1/2' Exhaust,ram air setup, ported and polished plenum, soon 3.45 9 bolt rear end with discs!

 

What do you mean by "updated" calipers? Do you mean the 89+ aluminum PBR calipers? If so, then you'll need to change the backing plates. They'll have to come from a wrecker too, 9 bolt backing plates for PBR calipers are no longer available from GM.