Not exactly but in the absence of any better information I'll offer that I added a couple to the hardtop frame of my 265 a couple years back and in studying pictures of your boat model there appears to be a lot of similarity between the framing of the two. I attached to the larger diameter tube, didn't write down the exact measurement but I used the Taco clamp-on holders, F16-2630-POL-1, they're sized for 1-15/16" O.D. pipe and given how they fit I'm guessing that's awful close to exact, they do come with a pair of white inserts that their website says would neck it down to a 1-11/16" outside diameter pipe. Good luck.
Brett