I can tell you three places you can get the right leather, but I don't know what kind you need.
www.eleathersupply.com
www.tandyleather.com
www.springfieldleather.com
I've bought from all 3 and I prefer Springfield Leather for their price but Tandy is pretty much the best selection and the customer service is really very good. They've got regional locations around the country so things don't have to ship super far.
I'm watching this thread with interest...I've got a trashed Ideale and a Wrights that sombody hacked into a swallow-ish thing that's just waiting to give me a seatpost enema.