All I know is what the BS does the rest is Greek to me.
See if this helps you. The pic below shows my truck with 33x12.5x15 tires and OEM 5.5" BS on the rear and a 4.75" BS Cragar Soft 8 rim on the front. So the 4.5" BS rim you are looking at would stick out even further than my front.
4.75" BS rims on both trucks with 33x12.5x15