So, I can't find the trunks (and the big Avon logo patches) anywhere but Ron Hale, and he won't ship to the US. I'm going to try to patch mine up. The fittings are in good shape, and most of the hypalon is good, it's only bad where it's been heavily creased, so I'm going to put a new collar of hypalon around that entire area. Won't exactly be stock but it should look fine. If it doesn't come out well, perhaps I'll ask if anyone is willing to pay some postage for me.
Here's an update on the project. Bet you've never seen a sea rider do this. I wanted to work on the hull, it's very oxidized, it's an ugly mustard color, and the previous owner patched it in a few spots with red gelcoat, poorly. All that has to go. So I flipped the boat. After looking at a lot of different options, I decided to do it in the water, I just grabbed the boat by the single bow eye and it worked out great. I built a frame for the trailer (and padded it with neoprene) and the boat is very nicely upside down now.
and here's one in mid air, lets see if this works: