Good Morning Neil (at least, it is still morning here...)

Assume you are searching for that part for a MC18 (as opposed to MC16, 21, etc.)

Not sure how current his site/inventory is, but there in Oz is a business called Tiaro Motorcycle Wreckers who has it listed in his New Old Stock Honda parts

Seems that part was also used on the RC30 (what price exclusivity!), so if you've a mate with one of those, just nip them while his back is turned...

All the best,
Dave