The factory units are made by Fujitsu Ten, maker of Eclipse. I don't think anyone has tried to see if a Eclilpse headunit can control the stock changer... considering the rate of failures with the stock unit, it's not worthwhile. AFAIK, no aftermarket adapters exist for our stock changers.

The dash is pretty deep. Just about any standard DIN sized aftermarket headunit (screen or no screen) will fit... as long as they accommodate the side mount brackets (which most Japanese cars use).