Dave-
I'll take a look at the house- Don't really remember. You might also check the old results from the PMA Monterrey Classic I think it was from the days when the G-cats were "new" to see if they were double trapped in those days in racing trim and possibly old Portsmouth numbers. Another suggestion is to check your mast wall thickness and presuming it's the same as a Hobie 16/Prindle 16 then you should be safe.

Kirt