Scubaboard member “captain” has a great link for making custom bands:
Vintage Double Hose • View topic - How to make triple bands by Captain Tom
I was able to get bands for twin Faber LP-45 that are 5.51"/140mm OD using an isolation manifold that is 190mm center-center rather than the standard 215mm. Unfortunately, I don’t remember the Scubaboard member who turned me onto this combo, but they have worked out well.
Thanks Akimbo, my tekkie guy has had to go home to Scotland because his father died but when he is back we will be working on setting up the 50s, all advice gratefully received.