About 1 out of every 10 78-80 Buick, olds, pontiac, g bodies (actually they were considered A bodies then but its the midsize line). My experience is that they were mostly in the pontiacs. There were at least 4 varieties of them per Eric Fisher (turbofish38). There are different heights, some require shimming them up from the bottom and some require cutting the bottom bushings down. This is info I have gathered from people I have sold them to. I've never tried to install one, though I still got 1 hanging on the wall. I think they can all be made to fit regardless of which one you get.