what car...? integra rear end will fit most similar civics.... they have rear discs... or try the jordan/type r honda, most will have rear discs...
why u want rear discs? get some better pads n just gonna b same. infact discs are bad if u ask me... cant handbrake em well enought, drums lock up easier!
if its stopping your after try green stuff pads! race or road... bit dusty but stop ya on 1o cents!
peace