you didn't say what seirra gearbox early four speed of later type9 five speed. in both cases i'm pretty sure that both fit. its the stud patten on the bel housing that you have to look at. and since ford have kept this the same on the zetec, cvh, pinto and early v6 you can useit on a zetec. the tricky part is the clucth set up you will have to use bits and pieces from both. kits are availbe from companys, such the people who install them in mk1 and 2 escorts, think there advertised in classic ford magazine. hope thats some help