I have searched high and low.
A company used to make a solid shaft for the part time change-over.
I did find the other kit that was available years ago.
Looks like it was Discontinued also.
Here one link on Amazon with a picture of it.
Link:
https://www.amazon.ca/Superwinch-900.../dp/B000CPJMWK
Your 203 may already have one of these kits in it.