Not sure, but if it is an original FICO fitting, they have been taken over by Ronstan so maybe worth a call and possible they have something to replace it with
This could be a possibility www.rileyfittings.com/goosenecks/rm85 Does it need to be on the track? Might be simpler & stronger to flick the track and have a fixed one.
The SS slide is an easy repair. If the cast part is alloy then it's easy to replace the metal and re drill. I would be inclined to drill out the pivot joint and replace the cast metal section with SS. and weld a new thicker SS U section onto the slide if you intend to retain the slide set up.
Jethrow said.. This could be a possibility www.rileyfittings.com/goosenecks/rm85 Does it need to be on the track? Might be simpler & stronger to flick the track and have a fixed one.