For anyone stumbling on this thread like me, I wanted to post my experience to save people some money and trouble. I have a 2020 Max I was looking to upgrade from paddle wheel to GPS speedometer. Dealership quoted me $1900 for just the antenna, not including install. I could not get a straight answer from moomba or zero off as to whether any zero off antenna with the 58700015 model number would work. I took a chance and ordered this one from ebay. https://www.ebay.com/itm/236619545421
In my boat there is already a cable labeled "GPS" under the dash with nothing plugged into it. I plugged in the antenna to this cable, and boom, it worked. My screen changed from displaying "paddle wheel" to "zero off". I just drilled a hole in the gunnel in front of the windshield, installed the antenna (it comes with peel and stick adhesive already applied), and the speedometer has worked perfectly ever since.

So to my knowledge, as long as you buy a 58700015 Zero Off antenna, it will work. I was very happy spending $500 instead of $1900.