The problem lies in the way the rules are written.
They now read: If the car was produced and sold with 2 seats on some models and 4 seats (including jump seats) on other models, the car will be classified as a Coupe and Sedan. Examples include Honda CRX, Ford Mustang GT 350's, Porsche, Nissan Z 2+2's, etc.
So, if we go by the rules as written, then the Triumph GT6's (as rear "occasional" seats were available) should be classified as a Coupe and Sedan.
But that's not really the way it should be. I think everybody believes that the GT6's should be considered sports cars, and as such, should run in Modified Sports (and/or Grand Touring Sport), rather than a Coupe/Sedan (or Production Coupe/Sedan).
The 2013 change that was made (to prevent addition of non-OEM rear seats), presumably to keep sports cars out of the Coupe/Sedan classes, is fine. But was anybody actually doing that? Not that I know of, so that doesn't seem to really resolve or address anything.
I'm still in limbo with my Subaru XT. Some models had little rear jump seats, and others didn't. As the rules read now, that means Coupe/Sedan. So, why should the GT6's (with or without their little occasional seats) get to run as Modified Sports or Grand Touring Sports, when my Subaru can't? The XT was Subaru's first attempt (admittedly not a very good one!) at a GT/Sports car.
Aren't Porsche's (at least 2-door models) and Datsun/Nissan 2+2 Z's considered sports cars, too? Not the way the rules read now.
The rules need to be changed to specify what actually differentiates between a Coupe/Sedan and Modified Sports/Grand Touring Sports. Although I wouldn't want to see it, perhaps the decisions should be made on a case-by-case basis by the committees involved, with a list maintained for all to see.
As for the final decision on classing of my Subaru, I don't really care which way it goes. The car can be built for either. I just want to see clear rules that can be easily understood, so I can build it without fear of having the rules interpreted differently somewhere down the line.