Actually there was a 2000 Cobra made, it was for export only to Japan and Australia.
also, another reason for no US cobra was the 99 Cobra horsepower fiasco, they were still dealing with the recall well into 2000.
I have a US 2000 cobra brochure that shows the car in two new colors, Aztec Gold, and a light blue color, and the R is the center of the brochure.
I remember that SVT decided not to produce a regular 2000 Cobra because of the efforts needed to correct the issue with the 99’s, amongst other things, but I don’t recall them building any 2000 variant of the Cobra other than the R. I know they produced an export model in other years, but are you sure it was also done in 2000?