Ive got an uk bugeye 01 plate and the gearbox needs replacing. The gearbox that currently in is code TY754VN2AA. But im finding it rather difficult to locate one,, can i put any gearbox from 01-05 long as its an uk spec wrx? without changing the rear diff? if that is the case which is the best code to go after, longer ratios ect... also could i put an late classic gearbox in ?