Cheers for the replies,
The plan was to get a long length of ali tube and get it beaded or machined, as I wanted a long length to clear the exhaust area.
But just found an 18" length on the net for not too much (I think), so that will do nicely.
I had to weld a couple of beads around my water pump pipework, don't fancy poaching myself.
I'll get some pics up when its fitted.