A. Sports Car Club of America (SCCA)

B. Classic SportsCar Racing Group (CSRG)

C. Society of Vintage Racing Enthusiasts (SOVREN)

D. Sportscar Vintage Racing Association (SVRA)

E. Vintage Auto Racing Association (VARA)

F. Vintage Motorsports Council (VMC)

G. Vintage Drivers Club of America (VDCA)

H. Historic Sportscar Racing (HSR)

I. American IndyCar Series (AIS)