Try these two places
Lucas Classic Tires, 2850 Temple Ave, Long Beach CA, 90806
(562) 595-6721
Coker Tire 1-(866)-708-1271
coker.com
They will probably need to know if the valve stem hole is in the center of the rim or off to the side.
I tried to get tube liners for my '35 Ford wire wheels from Coker's a few years ago and was told they don't exist. They told me to put a couple layers of pipe wrap tape around the inside of the rims where the spokes were. I've mounted a lot of big truck tires with tubes at my work and they always had liners, when I was a kid, my Schwinn bicycle had liners. I assumed everything with tubes had liners? I never tried going to a motorcycle shop, that probably would have been the way to go.
Did early Ford cars come with tube liners, if they did, why would something so simple be so hard to find?
Jerry