I would try Jerry Bates directly. Here's his URL and other specifics:

He may have some, or know where else to source them.

http://www.scaleaero.com/jerrybates.htm

Jerry L. Bates
Tel: 251/478-6720
102 Glenwood St. Mobile, Alabama 36606
[email protected]

I would say try the Don Smith Canopy, but Don's Hellcat has an 84" wingspan, which is slightly bigger than Jerry's.

Hope this helps...

Paul