Rim offset

[buddman (AKA Mick)]

So I was going to borrow some rims and tires from a buddy for the bogg today but went too put them on an midnite last nite the rear rims hit the outside of the drums. So this is my question. He runs a 14 bolt FF and 60 front, I runnin a 14bolt SF and a 10 bolt front, For 15 in rims which is what his are, what backspacing do I need to fit??  Forgot too measure his. Don't want too buy some rims that don't fit.  Thanks.