I use the Allen head screws from fastenal myself. (I do have access to an impact screwdriver, but it only rings the bolts off in the hub and you have to clock the rotor differently next time.)
I found my clunk problem by jacking the car up and dropping it while watching the suspension (mine also clunked when going over bumps at low speeds).
If you could have somone walk beside you with a flashlight and watch if anything moved as you moved slowly and then braked it could help you a lot.
(The front calipers have no slides that I am aware of, so I doubt it is that).
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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