I would not recommend those, they are normally for diesel spill off hoses, they have thinner walls and can collapse with time under atmospheric pressure with high vacuum inside especially when they get hot and softer. If you look at hoses that are specifically deigned for vacuum they have much thicker walls. But if you have a version with thicker walls or specifically designed for vacuum then obviously it will be fine.

can a stainless steel stud be screwed into the aerial thread instead?

bit late now, i replaced most of them yesterday. it looks like the job had been half done before, as the hose i was using (you're right, it is diesel spill off hose) looks identical to the hose that was on my engine - but was not the original audi stuff.

pic of of the original audi hose, showing how it breaks down. the original hose has the white stripe around it. the replacement is an all black outer. the ID and OD of the hoses were identical, so the walls arent thinner. it could well be a different rubber compound tho.

https://scontent-a-lhr.xx.fbcdn.net/...e2&oe=5511CD8F


link to the job guide sheet:http://www.audipages.com/Tech_Articl...sereplace.html
its easy, as long as the engine is cold and you remove all 3 engine covers. just remove one at a time and cut new lengths to suit. there is one vac hose that goes down the front of the engine behind the belts and plastic covers, no way can you get to that without removing the front covers and serpentine belt


what i used.
https://scontent-b-lhr.xx.fbcdn.net/...0f&oe=551BEDD5

I got this stuff 2 years ago but haven't needed to fit it yet. Very thick walled not going to collapse, and no woven coating to decay. Hopefully lasts longer than rubber.

http://www.bakerprecision.com/hosetech.htm