They are 17x8.5, actually. 40mm offset would work if the wheels where 7" wide. My wheels are 17x8.5 with a 35mm offset, and I needed spacers to run them. Stock wheels are 6.5-7" wide with a 38mm offset. So.... if the wheels are a 40mm offset and they are any wider than 7", you'll need some help to get them to fit.