The only places to by the proper pipes is Audi or TPS if you have access to someone with a trade account there. I have not come across any after market solutions with the exception of DIY. The 2 hoses are showing £87 a pair from Audi.
To make your own you will need some 19mm Rubber or Silicone hose.
Now this is what I plan to do on an ABZ I am rebuilding, partly because I already have some of the components.
The passenger side pipe is indeed moulded at the top to self seal but it still pushes onto a piece of tube that will allow a cable tie to be used to seal the end of an ordinary bit of 19mm rubber tube. Both the lower ends in the 'V' are secured by clips.
I have bought 2 x 90° silicone bends and I have some ali tubing from another project. Add 8 large flat cable ties and construct you hose.
Points to remember:
1. Ensure the Ali dosn't vibrate against the block.
2. MOST IMPORTANT - That if your existing hoses have perished (and they do) then they are letting in unmetered air. This will effect performance, economy and more importantly the transmission.
3. Doing it this way is a 1/4 the price of the Audi parts
4. It's only vacuum so jubilee clips aren't vital.
Take a wander around Halfords and see what you can find in the way of coolant hose.
__________________
Conan (the Librarian)
Watch it if you dare
Currently,
2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block.
1997 4.2 A8SQ - the Projekt. 12 years and ongoing!
1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard
2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion.
2005 C5 Allroad 2.5TDi FE - Grey - Workhorse.
2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter.
Previously
2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex
1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure.
1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex.
2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on.
1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8.
And a list of non VAG going back 40 years before I saw the light. 
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