That's probably a Taylor part. Look on-line at west marine (or others).
However, when that part broke on out 245 Sundowner, I changed to metal hardware. This just required mounting a different bracket on the windshield frame and the corresponding part on the ends of the tube. The pivot point then become a through bolt instead of the snap-in plastic button-head.
I don't remember exactly what I used, but I think it was similar to these part (below). With your set-up, where you have two tubes in the plastic socket-end, you would have to look for a different "eye" end.
Windshield mount:

Tube end:

_________________
Gordon Arnold
New Hampshire
2003 268 Vista ..................................................................Prior: 97 245 Sundowner
