Ok I understand. You may try Hunter Marlowe to see if they have a source for that part.The frame and the entire plastic moulding that covers the space behind the control panel is one moulded piece. The Yanmar control panel attaches to it. I had it removed recently to replace the fire control system head just aft of the panel - the plastic moulding was extracted in one piece but there is significant sun damage (the exposed part has become brittle) so I'm looking to replace the part.
Try a plastics manufacturing shop like: Plastic Fabrication Vancouver | Custom Plastics | Walsh Plastics Ltd..........find a replacement plastic frame...........
I took a quick look at Amazon under "marine instrument pods" and there was a lot of stuff in the general description of pod. There is an outfit called "Edge Products" that seems to make similar things to your need.Also it did occur to me that the part you need looks a lot like the back of a pod for mounting on the pedestal.Maybe something there?Thank you for the suggestions. No joy with Marlow Hunter via the local dealer here, but there are several good plastic fabrication places near Sidney, BC - I wanted to see if there was anything out there first before committing to the expense of getting a custom part built.