I wasn't really concerned about class designation. Those of us that participate in SCCA/NASA/USAC sanctioned events should follow the guide lines for their specific class.
If I were going to compete in Solo etc...I would challenge not being able to use them on a Contour/Cougar because so many other vehicles use the same design as a bolt in with no serious modifications required, and aside from a more rigid mounting method the actual performance benefit would be little more than what the SPC offset upper strut mount offers.
