How to get/make Fresh Air Vent to Dash Tubes?

Has anyone had to make the vent tube connector for behind the dash? This is the round tubing that goes from the fresh air intake holes to the rectangular backs of the fresh air vents that are in the dash. It’s Moss P/N 456-115 (part #6 on this page http://www.mossmotors.com/Shop/ViewProducts.aspx?PlateIndexID=29082&SortOrder=8#top

I’ve already done a tour of Lowes & Sears Hardware so I’m hoping someone may have fabricated a replacement before and can tell we what bit and where I can get them from to make this. Otherwise I’m guessing the route will be a cover for the vent. However, I’d like to address this now while the dash removed rather than try and return to it later.

Thanks

Simon

Try Chris or Tony for one.