This can be easily made. The system uses two mounts, they are the same for top and base, and a post. The base does not have to be massive, it will work just as well with a flat piece of material. Here is a base I made for my workshop for working with tops:
In this case I just used a sheet of plywood. But you can do the same with corian, plywood covered with laminate etc.
I contacted my Sea Ray dealer and they contacted Sea Ray, The base I was looking for was made by a vendor for Sea Ray. They are no longer making it, they sent the mold to Sea Ray and they made it for a short time. They are no longer making it. Bottom line is it cannot be ordered, the only way to get one is to find it in a dealer stock.