I'm confused and hope someone can advise me. I'm looking to tidy up my old GT outpost, 1990's model. I'd like to get a new rear mech for it (mine is a little slack), but am not sure what type to get. I have what I assume is the original SunTour mech, which has no hanger, which confuses me. The hanger is built into the frame and mech bolts onto the frame. Let me kow if I am talking out of my rear end please :-). Anyone got any advice on what rear mech might work for me? A model or picture would be nice.