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The 18x8 +42 will fit, these are likely too wide, and I am unsure about calliper clearance.
https://www.fitmentindustries.com/ Is a decent resource, or you can go to the manufacturer and check with them directly, which is what I did with my TD Pro Race 1.2s.
Max caliper protrusion is what you need to consider...it should be around 36mm which is what I measured for my calipers on my F54 JCW. I might be over a tad but I wanted to be conservative as I ordered custom for wheels.
I would contact them directly to see if they know what profiles will fit your specific application. If they don't have your application already noted, then see if they can send you a wheel cross-section that you can print out to scale to see if they will clear your calipers. The 'better' wheel manufacturers should have this readily available. You can then hold the profile of the rim up to your hub to see if it will clear.