Do you know what the offset is on the m37 wheels? My factory 19’s aren’t even close, which was a let down. I downloaded the template from concept z and even with the 12mm spacer, I’m a half inch off.
The spoke shape on those z wheels you have are really angled out (not sure how to better describe it) where the 19’s are more arched on the inside, which is where they hit. Wish I knew someone with the 19” G37S wheels that I could test fit.
As far as the Rockauto calipers go, they’re the same and should work fine, based on what I’ve been able to find.