is this offset ok?

[hotstang_46]

20mm front (18x8.5) and 25mm rear (18x9.5)???

i really like this one set of wheels on ebay......

 

[twogts4us]

Sounds ok, but a more telling measurement is the back spacing. Offset is the distance from the centerline of the wheel to the mounting surface of the wheel. Back spacing is the measurement from the backside of the wheel mounting pad to the outside of the rim flange. Here, this may help ---->
https://www.rsracing.com/tech-wheel.html