i have temperarily used some KYB shocks that were ment for an RA40 Celica..if you have lowered springs..they are a good idea..because they are about 80mm shorter stroke than an AE86 item..and a bit stiffer in the valving..but for a bit more bound/rebound..i have heard to use a holden HQ 1 tonner rear shocks..about the same sorta free height as the RA40 one, but shit loads stiffer!
Matty