It's worrying that such a basic and perishable part is now so difficult to obtain. It's a relatively simple bit of rubber tube; you'd think there would be some good 'universal' products available to replace it.
Best I could find is this ...
https://www.jegs.com/p/JEGS/JEGS-Uni...25495/10002/-1
... which goes back to my suggestion of knocking something together using metal couplers. Might be worth a try, at least as a short-ish term solution ...
__________________
Mark
------------------------------------------------------
2002 FE S8 Ebony Black Pearl
------------------------------------------------------
------------------------------------------------------
Cars Owned:
The Tesla Era: 2020 Model S Performance Ludicrous+ (present)
(Black, with all black premium interior and carbon fibre décor, 21" sonic carbon twin turbine wheels and FSD capability)
The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present)
The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo
The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust