Here's an offset calculator:
https://www.1010tires.com/Tools/Wheel-Offset-Calculator?srsltid=AfmBOopjutRKkLANJKt1GMDvJdsMvdU fzLQBixsg2FtLnF1bHItAWG2B
It will help you determine how far in / out a wheel will be compared to your existing ones. My guess is with an offset of 40, you'll have clearance issues. Keep in mind on the rears you have the suspension arm to deal with along with the e-brake cable (that can be pinned down).
Keep in mind if you have to add mild spacers, you'll need longer lug bolts. Thick spacers of 15mm and more will kill any weight savings you get from new wheels.