WOW! THANKS! Both of the posts I got are very helpful. The boat is 1977 H-16. I am attaching a picture of the mast and the mast step. I ran out and took them in the dark with a flash, so quality is less than perfect.
I know this is a silly question, but is there a mast base? It should be a cast aluminum piece that rivits into the bottom of the mast.
IF the mast base is a cast aluminum plug that fits into the bottom of the extrusion, then I have one, and you can see it in my blurry photos. If not then I do not, but I THIHK I have it. BUT the other parts shown on the next response are not present.
If it is just the extrusion on the bottom, you will need to by a mast base. Also, pics would be helpful if you can.