I've purchased a batch of modified Strange Quick Releases to fit my paddle system. They are the splined style with a 4130 stub and have the same bolt pattern as the SPA and RaceTech units (three #10 fasteners on a 2" bolt circle). The quick releases are $95 and I also have a few predrilled Grant 250mm suede steering wheels to match, they are $115. I also have the CAD models for them, you can see them here Steering