I'm not sure you can assume that the bars on a almost 20 year bike are stock. Then there's the risers, a lot of people upgraded those to 4"
I believe the bars on all models were the same OEM, but I'd have to check the parts suppliers to know.
The seat and tanks are different on the Interstate, so that could be the diff.
Stock interstate bars are not as wide as stock standard bars because of the faring
Jeff, after reading your response, I got thinking, I can't feel any difference between my Tourers and the Interstate as far as bar width goes. So I went and measured them. Both the Tourer and the Interstate measured were bought used, so can't state they are OEM but feel they are. Both also have the same Kuyakyn grips. They both measure 35" from tip to tip with the grips.
I then checked the 99 models of the C, CT, and CF on Partzilla and they do list a different number for the CF, but the graphics, which I believe are very accurate, show them to be identical.
??? ???
The only thing I can say is, a PO could have changed my CF bars to C or CT bars.