Ok folks this is what I've found for all those of you who might contemplate a fork swap in the future.
YZ yokes 1982-1987 use the same headstock bearings so one problem out of the way.
I can't comment on the length of stems for other years only for the '87 set I got from a breakers.
YZ yokes 1987 are almost a direct swap. They are only ~5mm (>1/4") longer in the stem between bearing cups.
The stem is slightly lipped beyond this so I have carefully removed the lip with a file so the bearing slides down the extra 1/4". Put in a spacer above the bearing and fitted the yokes.Job done.
If you fit a spacer below the bottom bearing you lose use of the turn stops, so the above is probably the best way to do it.
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