Vintage car rubber seat bladders - any manufacturers?

[larrylamb11]

The inflatable rubber bladders in the seats of our 1930's steed have well and truly failed.... The seats could be re-stuffed with foam, but it would be preferable to buy some new ones or have the bladders re-made in a modern, durable rubber.
Clearly this isn't something one can buy off-the-shelf, so does anyone have any experience or know of a firm that might either sell these or be able to undertake such a task? We have the old (extremely tattered) bladders as potential, albeit delicate, patterns.
Any thoughts from those that move in the pre-war circles?

[v8250]

larry, you should have called a quick google comes up with a host of potential suppliers. yours, v8250

https://mogparts.net/index.php/trim/trim-cockpit/s...

http://www.comflair.com/en/products/lumbar-support...

https://www.google.co.uk/webhp?sourceid=chrome-ins...