Posted this on Club-XM last year.
Metalcaucho catalogue offers a large range of rubber/metal aftermarket/OEM items across many marques.
As well as OEM pattern hoses for specific vehicle applications, their catalogue also contains some very useful universal straight and angled hoses, hidden away in the misc section of the printed catalogue.
These straight (1m long) and 90°-bend (generous length) items are available in many internal diameters (IDs), and this is the current listing of them:
90°deg bend
part.no. - ID
09618 - 20mm
09619 - 25mm
09620 - 30mm
09621 - 35mm
09622 - 40mm
09623 - 45mm
09624 - 50mm
09625 - 55mm
09626 - 60mm
1m straight
part.no. - ID
09001 - 20mm
09002 - 25mm
09003 - 30mm
09004 - 35mm
09005 - 40mm
09006 - 45mm
09007 - 50mm
09008 - 55mm
09009 - 60mm
09010 - 65mm
09011 - 70mm
09012 - 75mm
09013 - 80mm
09014 - 32mm
The hoses are high-quality EPDM, and reinforced.
They bend well without collapsing. The 90° bend can be opened to a more gentle bend (eg 135°) if needed.
I have used the 20mm ones on our XM 2.5 for heater hose runs across the engine bay.
Metalcaucho online catalogue (motor factors may have a printed one as well):
https://www.metalcaucho.com/en/
Choose a marque, or click Catalogue
Enter either an OEN part number, or their own number in Catalogue Search (eg those above).