I know of 2 non-stock engines that have been fitted to the MX-5 gearbox.
They're both Mazda engines (the KLDE/KLZE and the 13B/Renesis rotary). The KLDE can be fitted to a MX5 box with an adapter from Claire at crapengineering. The 13B uses the RX-7 or RX-8 bellhousing.
Besides, there's 2 Ford options for a RWD gearbox for the Zetec. There would be no demand for a production run of bellhousings to fit RWD boxes from other manufacturers.
The Ford and Mazda interchangability you're thinking of is the Duratec and the mark 3 MX-5 - the mark 3 box should fit onto the Duratec.
Could always get a type 9/MT75 and a Zetec and fit it with the Mazda running gear, but that would be a waste of time IMO (unless you were going into a race series with an 1800cc class limit).
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