AFIAK there are only 2 manual trans, 1 is for the SPI, and the other is for the rest. So long as you get it from a duratac or zetec engine you should be fine, dating back to even many ZX2s and ford contour...
Very common trannies, They've been made since I think 1992 to still to this day, so I think it won't be hard :D
...and fix your rust... Letting your wheels fall off is not recommended...
2000 Ford Focus US Spec Zetec 5 speed "Blue Dragon"
2000 Renault Clio 1.4 DOHC 5speed "Snap Dragon"
Hatch Nation #32