I recently picked up a Vanguard boat with an Elvstrom mast and it looks like I'm missing part of the gooseneck, or it's the wrong one. Any idea what I'm missing and where I can find one? Here's a picture of what I have.
Yes, you are missing a cast aluminum part. The boom does not look like the Super Spar shape that is typically being used for 470s, so I could not say where you could find the fitting. But the boom and the fitting have to be a perfect match.