(DG) Replacing early style masthead Wind transducer

[sailingriki]

I don't know why this thread was closed, there are plenty of questions for these old instruments!
I talked to a Raymarine rep and was told the R28170 would plug right in to my old Autohelm mast top base. But when I went to buy one at West Marine I read this:

will this item E22078, replace my original installation of a ST50+ masthead windvane and screw into the existing ST50+ mounting block (threads and electrical/data connection at the top of the mast head?
Asked by Dean the sourcer 2 years ago

Verified Reply - Customer Service

The part number for the ST50+ transducer is D168, but it hasn't been available for many years. There aren't any current wind transducer offerings that are compatible. You may we able to locate a used replacement. Otherwise you may need to consider replacing the instrument entirely.

I'd like to replace my mast top components but understand there is a problem with wind speed, some say adjustable some say not. I have old Autohelm square instrument so, I guess, not a 40 series?
What is the final word on this please?
Thank you!!