There are two main suppliers, it appears – SPIRAGAINE and SCEET.
The first is French and doesn’t want to sell if they think you want it for a Socata!
The second doesn’t do metric.
It’s a shame 38-mm hose wasn’t used originally.
Lug nuts on cars are typically 19-mm for a valid reason…
is this what you are trying to find :
http://www.ebay.de/itm/251435749277?trksid=p2055120.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
http://www.ebay.de/itm/380745850999?_trksid=p2055120.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
http://www.ebay.de/itm/1m-Luftschlauch-Heizungsschlauch-Vorwarmschlauch-Pappe-Alu-Pappe-40mm-4223-/321301002372?pt=DEAutoteile&hash=item4acf083884
