my '88 now has 96 beams and brakes. it measures 49 1/2 inches between rims, measured directly under the ball joints at the lip at the widest point of the rim. the rims are stock aluminum rims.
i have not noticed any great protuberance of tire from the wheel well but i would say , if there was no rubber on the rim and a straight edge was put on the outside of it, the edge would hit the fender about a half inch into the wheel opening. hope that helps.
oh, for those red necks amongst us, protuberance means 'stick out'