The only source that comes to mind is D&R Marine (508) 644-3001 Rudy Nickerson may have the patterns for those, otherwise... I'd just take the old ones to a local boatyard or boatbuilder that might have access to supplies of teak-holly plywood and could make replacements. If you want to DIY it, Boulter Plywood is a good source, or GOOGLE "Teak-Holly plywood"