Check with Tom Balding out of Wyoming! He might be able to make it for you.
ETA: a google search shows Lazy B General store out of Houston usually carries them, it might be worth giving them a call to see if they have any in stock since their site doesn’t seem to be working (at least for me).
It looks like Weaver leather is the brand name, I’m not sure if you could call them directly and see if they have any distributors that are still selling it? I hope you find it or can have one made!