are the rear calipers the same for all s5 na rx7 i have 4piston in the fronts . sigle in the rear with auto supension does that matter for the rear calipers im gona get a remand also on the caliper how there is only one bolt to separte the caliper and the other side is like a bolt but its not its supposed to come apart when you remove the one main bolt its stuck is it supposed to come out, its looks realy corroded i know this sounds confusing sorry

 

I'm pretty sure there are both vented and non vented rear.

if you have 4 piston front you should have vented rear.

 

are s4 turbo 2's vented and 4 piston?

 

yes

 

The Vented rear rotor caliper and solid rear rotor calipers are not interchangeable. The Vented ones are much bigger (wider).