@AL Yes there is a difference / the CMC and vintage speedster roof frame and are not interchangeable due too slight differences in the corner radius above the rear window So, CMC bows to CMC top OR VS bows to VS top. Also the black composite VS header bows have had warping issues , perhaps new owner Justin will address this . I have a bad one that Kirk was going to exchange but now I'll have to talk with Justin about doing that.