I've got a few adapters you can have, however, they might be specific to the newer models of booms. But, I've got sht tins of them, so your free to have one.

Another idea is, go to a auto shop (Pro Auto, Super Cheap) that has a radiator hose bin (normally $10 a piece etc), and get a hose with 50mm outer dia, and 33-34mm inner dia. Pretty much standard fittings. They will be shaped for a particular model of Holden or Ford. Just find one that has a straight section, and cut it. Here's a pic below. These radiator hoses work a treat. You only have to clamp a little bit, and they won't slip. Better than the boom adapters IMO.



PS/ I'm sailing Boggy lake tomorrow. I'll pack one for you, in case you make it.