Thanks to info from Leith C, I have discovered what I really want - a set of fork yokes as originally fitted to these RM models:
1978 RM125C
1978 and-a-half RM250C2
1978 RM400C
I could probably get away with just the top yoke, including the handlebar clamps and rubber mounting assemblies. However, I'm willing to also take the bottom yoke and steering column. All the original fasteners would be of advantage, but not necessarily essential. I'd prefer complete in good usable condition, but beggars can't be choosers, so let me know what you've got
!
I did find a couple of reasonably-priced sets on Ebay in the USA, but the postage costs more than the parts (thanks no doubt to Ebay's "postage partner" Pitney Bowes - easy for the seller, costly for the buyer), so I'd prefer to treat those as a last resort.
I'm in Sydney, so could collect if close by. Otherwise, I'll pay whatever the postage costs.
Thanks & regards,
James