Pic below. It'll be custom, not catalog item, I'd expect. So you need to get one from the boat builder, or their OEM supplier if you know them, or get a s/s fabricator to copy it. Getting it copied should be easy, as it is a fairly straightforward looking item. you may be able to get a s/s fabricator to cut and weld in a new starboard side plate and top hoop, as the port side looks ok