Im pretty sure only 5spd boxes from 1.1/1.3 mk3 fiestas/mk4 escorts will fit and work. Mk4/5 fiesta, puma and ka boxes are all hydrolic clutch(whereas the mk3fez is cable). And I think the starter motors are in diffrent places too

They are called bc5 gearboxes too if you need to ask about. Pretty sure the ratios are the same tho. Easiest way I find to do it is - disconnect fuel lines, water pipes, relevent wiring, exhaust, gear linkage then 2bolts on left side eng mount, 4 g/box cradle bolts.then drop out from underneath. Job done