In my opion, Revell is the best. Revell has offered SC and street versions in the past. I think the current offering is an SC. The only issue I had with the street version when I built it a few years back was that it came with side exhausts. A lot of street cobras did not use the side exhaust, so I converted mine.
Studio 27 did offer a fret for the Cobra.
I don't know if it's still available. It doesn't show up in Hobby Link Japan's listing. I think it was moade for the Fujimi kit, but it works on the Revell.
HTH,
Gerry