Hi Strick,
Actually my current 20" transom measures 20.5ish and my current 20" classic Glasspar as the factory made it measures 21". I think it is partially due to the geometry of the transom angle. So if you measure straight down rather than down the face it would be 25". Thought my old Parker with 25" was more than 26" but the memory fails.
My last boat had an enclosed transom with a Gil bracket, probably why I'm trying to get every fraction of an inch I can.
