Hi, I'm looking for a replacement spreader fitting for my "new", 1979 Invader 22.

Apparently I'm still not allowed to post attachements, but I uploaded two pictures here:

https://ibb.co/ZN4r4sT
https://ibb.co/DVG1vv1

The company is long gone of course, but maybe someone has an idea what parts may be compatible, or who made the mast? If it ever had any type plate on it, it's not there anymore.