Check with PYI Inc. I think I called them last year about a mount for my DRS4D-NXT and they said they were fabricating them. I ended up not using one but instead fabricated one of my own with some starboard. https://store.pyiinc.com/products/base- ... 4237909505
I settled on seascan radar mounts. They have a cnc setup and will supply a mount with holes in the base that line up with the currently surface mounted dome. They are also supplying a 9 degree tilt.