wally windsurfer mast foot conversion

Don't get it. Who's looking for what part to fit where?

Mate, if was were living here and wanted to windsurf, you'd be doing longboards too. And ice hockey in the winter.

Back to the question: if his model is 1985 indeed (how does he know, did they really have the years on the board??), then this is not the mast T nor the dagger that was being used then.

The mast insert for those models was a full slider, with a little pedal. I'm pretty sure it's the case of the Aussie-made version too. Mind you, there was a year (1984??) that had a slider and a hard plastic receptor for a black mast T bit.
Ditto the centerboard: the 1985+ vintages were already on retractable daggerboad.

Will wait for more details from him before looking for answers.