John,
The 520 is coming along nicely. I plan on installing the Schroth Harness on my, in progress 420R (with track day roll bar). Other than the rogue bolt fitment issue, how are you liking them? Any insights on installation and how they are working out would be greatly appreciated. I believe there are some options on how the shoulder straps are mounted to adjust the spacing on the shoulder width (for HANS use etc) - but I am not really sure. I plan on using them with the standard leather seats. The car looks amazing!
Charlie