I was on the phone with Wilwood a few years back requesting a matching set of SPF brakes for another project and they told me they couldn't give that information out because it was SPF specific and I would have to call them. It led me to believe SPF had a specific package but I never confirmed it. It was a long time ago so maybe now they might give out that information. On the other hand, it's likely to be standard Wilwood part numbers in the end.