Welcome to iBoats . . .
Boat owner's/operator's manuals tended not to exist 'back in the day', and for the ones that did exist - it was mostly navigation stuff.
So, if you have not found anything by Searching the Internet, it may not exist. Boat engine manuals tend to be the best resource available and the rest you may have to figure out on your own.
Ebbtide has changed hands a couple of times in the past few years, and I believe their production facility is now making other brands. You might find that 'Taylor Made' windshield support struts fit your need for the windshield supports.
