Front runners, back spacing.

So I use modern inset rims off of a 05 Dodge Magnum for the street (got them with tires for two hundred bucks). I have an extra wide rear axle so that worked fine so I didn't need backspacing back there. But I needed to buy some 5 on 4 and 1/2 by 5 on 4 and 1/2 inch and a quarter adapters to make the fronts work. Later I paid a Machine Shop to hog the centers of this front rims out so they fit without the adapters. But when I was running those adapters I would just put my Front Runners on those with no problem.