FREE- this ballast box is available at no cost to the new owner other than travel cost to pick it up.
It is John Deere part number WPGHB539. They refer to this one as "frame mounted". The spring loaded pins
fit my Click N Go brackets (on a Model 455) and one bolt (Included) connects the ballast box to the rear hitch plate mounted to the frame.
The ballast box DOES NOT include the two upper mounting plates (which would be simple to make from two scraps of steel plate)
Diagram of the unit included here: https://aftermarket.supply/john-deere/wpghb539.html
I have seen ads for this ballast box stating that it fits these model Deeres: 316, 318, 322, 332, 420, 430. Can't vouch for that but it for sure fits my 455.
Can send the new owner photos before they make the trip to the Phillipsburg, NJ/Easton, PA area near the Delaware River.