245/40 is the same height. 255/40 is still fine to fit also but will be slightly taller. You can go into the wheel/tire subforum to see what that will look like on other cars and even better use this:
https://www.ft86motorsports.com/wheelitfit/
At stock height, it will really be poking out there with that offset wheel you are ordering. If going with coils or springs you'll be fine though. Springs will need camber bolts to get it looking right in front though.