gearbox compatability


hey guys! my detomaso has been garaged for the last 2 months with a
knackered gearbox because i simply haven't been able to source a replacement!
its an auto box and the prices i've been quoted for a rebuild are just scary!
I'm trying to avoid converting to manual.. my question is, does anyone know
what other cars i might find that gearbox on?? surely it wasn't designed just
for the charade..the oil filter and some parts are compatable with i dreaming??