From what I've found out, the automatics have the starter on the passenger side, and the manuals on the driver's side, so it's only the manual application that works. Some say it won't work with a 904 transmission, but Mancini says theirs will. I don't know if the one Mancini sells is the same starter, but it sure looks like it. Perhaps they modify it. I do know that the top mounting hole is threaded, and needs to be drilled, but that should be it. Now when using it with the GenIII Hemi, the block may need some grinding, which I can't figure out since that what this starter came on. Perhaps the older transmissions locate the starter a little higher than it would be if using the transmission it came with. I don't mind being the guinea pig other than I don't want to chew up my new flywheel. It just gives so much more room for headers.