I've been looking for the same type of doors and probably have to make replacements - the material is called tambour.
Here is a place that may be able to match the size close enough: http://www.surfacingsolution.com/Tambour.htm
I saw it on the FP site, try FPmarine.com. Also, saw it listed on eBay about a week ago. Google tambour door and it will show it. Also, checkout "woodworkers warehouse"