Right I have both a frst and esrst and can tell u the followin,
the gearbox out of a mk4 will fit no probs mk3 escort box will not.
Your lightend flywheel won't work. ( no cps marks)
and in my experance the fez box has shorter gears as my fez Is reving high at 130 where the Scort goes to 145 ish with revs left hth mate!