I recently bought the SPC arms and I also purchased the Sage 30mm RCA. After reading this I contacted PHML to see if there was a smaller RCA. I ended scooping up a Sage prototype which is only 18mm which is pretty much the minimum to clear the LS calipers. I'll be installing these, along with my LS brake swap all at once. I'll write up a small review once trial and tested.

 

please do, i'm planning to do the same setup and would mosdef like to know what i'd be getting myself into.