u can't just throw a third member in . all the axle's are different. so you need to make sure u get the right member for the axles that are in yoru car. in a gt-s ae86 there are 4 different 3rd members and 4 different axle sets.

don't ask me how i know all this......

i can sell u the whole rear end out of my 86 gt-s but i have over $2000 in it at this point so it wouldn't be cheap.

and a sr5 third memeber won't work, its smaller and you'd have to change otu the whole rear end. plus sr5 rear's suck. don't waste ur money or time on one.