[Great Lakes Cruiser]

We are trying to get a spare key for our salon door. The boat is an 89 3600 Convertible. The lock is a Rozeto & Casareto, that uses a skeleton type key marked with the number 3. I reached out to Tiara, but they were unable to help. I reached out to the manufacturer but they don’t sell retail, only to builders. Has anyone been able to find a place that can supply these keys? I have called several, local, locksmiths but they have been unable to help.