whats it to fit to?

if its to a silver top or a cvh then you need 2 gearboxes.

a focus/mondeo black top petrol gearbox and also a focus TDCi gearbox

you then mount the bell housing of the TDCi box to the petrol rear half making a gearbox with hydrolic clutch and cable sppedo drivewith focus mounting points and also able to fit to a CVH/ Zetec silver top while retaining a petrol gear ratio set instead of the derv gearset.

EDIT

the st170 box is not an mtx75 either!