The proprietor of my local NAPA auto parts store is very friendly.
There are many pre-formed hoses available for modern autos and he has
shelves in the basement that are full of these hoses.  He lets me go
down and look through them and you will be amazed to find out how many
of them are adaptable to player-piano use.  Most are soft and flexible
and have only one covering of twill on them.

They are a little pricey but some can be used on more than one piano
and there is no postage!  Check it out.

Skip Woodhull - S-K Piano
Lima, Ohio