Help! Need to repair vintage Fanatic 320 windsurfer mast foot

I have this Fanatic 320 windsurf board (ok, ok, I admit, vintage stuff),

which has this kind of sliding contraption to hold the mast foot…

but just a few days ago my mast foot broke apart like shown here:

and here …  Aaargh

Does anyone have a suggestion what I can do? Are these parts still available anywhere? Can I just one of these new rubber-mast-feet and somehow screw it on top of the this contraption?

Help, help, help! SOS - SOS - SOS !

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