Just confirm your AMP rating on the alternator.
From memory, VR4's are 60amps?
As long as the rating is the same, it should be ok.
You should be able to change the pulley over also if it is the wrong one.
I believe vr4's / evo's / magna's / borg's share the same alternator dimensions but not sure on the plugs / amp rating.
Pull yours off, take it to a wrecker and have a look.