Thought this might be helpful if trying to figure out wheeling fittings in regards to how much a change there are between 2 different wheel's inner clearance and outer position.

Wheel Offset Calculator

Here is a link to rominl's wheel and tire fitment guide (that I am SO THANKFUL FOR!)
rominl's fitment guide

Using these to sources of information is helping me to decide what size wheels to get, especial when get rare sized wheel of doing fender/body work to get them in. Hope it helps you guys too!