tgreaves, First and foremost, welcome to the boards. Glad to have you aboard. Second, they best places to have stuff like that made is usually business that either can make backpacks or someplace that makes sailboat sail repairs. 9 times out of ten, if it doesn't exist or if the existing one is inadequate, just design one yourself and let them do the work. If, they are resonable it won't cost you too much.
Now, care to tell a little about yourself? What kind of diving do you do, where do you dive etc... we love stories!