Hello! I recently picked up a Wide Body Kit for my G37xS sedan by a company called EPR (currently , and https://www.ebay.com/itm/For-Infiniti-G37-4Door-TP-Style-FRP-Wide-Body-kit-front-rear-fender-Side-skirts-/143460202687). I have never bought aftermarket wheels for my car before, but I've spent a fair amount of time learning about how to choose measurements. I'd like to confirm with the community that what I've found is good, and if not what I should do instead. I appreciate your time!

To start, here are the stock wheel/tire specs for the AWD Sport (including Backspacing):

• Front:
  • Wheel: 18 x 7.5" +45mm
  • Tire: 225/45R18
  • Backspacing: 6"
• Rear:
  • Wheel: 18 x 8.5" +50mm
  • Tire: 245/50R18
  • Backspacing: 6.75"

This kit will add 3" to the front fenders, 3.75" to the rear: right away appearing that we'll have no trouble fitting a 10.5" wheel. The rear could fit as wide as a 11" wheel, or technically 11.25". With the help of measurement sites to calculate offset, these are the measurements I came up with:

• Front:
  • Wheel: 18 x 10.5" 6mm
  • Tire: 285/35R18
• Rear:
  • Wheel: 18 x 10.5" 6mm + 20mm spacer (proper clearance is 25mm)
  • Tire: 285/35R18

Anything wildly wrong with what I have above? I have also included pics of the kit taped on to my car: