I need some help in where to go looking for cross references on what transmissions will fit a 1.8l Miata.

I need a bell housing, seperate from the transmission, like the big American iron build them, that will mate to a Miata motor. I know its a common transmission across Mazda stuff, but I've never seen the Japanese build them anything but one pc. I'd prefer to find one that already exists rather than trying to build my own.

Any suggestions for locations to go look (Spec Miata page does come to mind) would be appreciated.

Thanks
Matt