I did have a chance to poke around briefly and nothing turned up that you need. I simply forgot to report back. I know for sure I have a belt that will work for you, but I can't say how long it will be before one turns up. I know for sure I have a charcoal belt from an '83. It would be a center buckle because I used the outer belts in my '84.
As I'm typing this, I forgot all about the two parts rigs I have. I'll check those out later today.