Here's your link, Charlie
This is the place to find this as well as other fittings for the 272 mast. I posted the same question here a few weeks ago and was steered to this site. I called and they have the part, but unfortunately it was a little too steep for me at about $180. I found a fittting that will work on eBay and will shortly be riviting it to my mast. I won't have the ability to vertically adjust it, but since I am primarily looking for the ability to wing out my jenny with a whisker pole, I think it will work fine. Good luck!