Ok, how here goes some fun for you....
What I did on my widebody to get my right offset was the following....
With the car on the ground as it is, take a straight edge that will extend from the floor to above the edge of your fender. Then use a tape measure and measure outwards from your hub (where the wheel bolts to the car, that exact surface and do so with the wheel on). Do this with two people maybe to get an exact result, and double check all 4 corners, both fronts should be pretty equal, as well as both rears. This number is crucial down to the 1/16" of an inch, at least it is to me.
Anyway you'll get a number, take that number and multiply it by 25.4 to convert to mm.
That number is a factor of your offset. Mainly take the width of the wheel you would like to run, and then divide it in 1/2. if it's a 9.5" wheel it will be 4.75. Convert that to mm by multiplying x 25.4 which would equal 121 rounded up. The centerline of the wheel is then 121mm. Then take the number you got from the measurement and subtract it from 121. Say it's 4.5" you would then get 121 - 114 = 7. That number is your offset. For the wheel to fit to the fender line you would need to run a 7et. To have the wheel sit in futher simply add to that number, for it to sit in 1/4" add 6mm. And so on.
Also if you liked where the wheels sat with a 20mm spacer, just ask for 1" bigger lips on the wheels. It's close enough.
Let me know if you need more help than that.
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