Yes it will bolt in , it is a direct swap, apart from
1) The handbrake cables (either buy new Rallye ones or its an easy job to modify the old cables to fit the calipers)
2) The triangle mounted fixed brake pipes, (you will need different length ones to reach the calipers)
3) The Viscous coupling, (which may or may not fit the original propshaft end, however you can always refit your original VC unit to the Rallye diff)