You can contact him but he's based in the US. He had the pipe made up as a one off but the guy who did it still has the jig/measurements etc to knock some more up, and will do so if enough people want them at roughly $300 US dollars.
I was going to simply get a machine shop to knock something up for me, as i'll be able to give them the old Y pipe as a template. Prob much cheaper than buying one pre made.