It appears even Honda got this Fairing stay wrong.
I have a photocopy of the parts book copied for club members which originally stated the RC and RD fairing stay have the same part number; however this has been corrected by someone stating ERROR in big letters.
RC Fairing Stay 64510-MA3-770
RD Fairing Stay 64510-MA3-850
Next to both of these part numbers it is written £162.16. I purchased this copy in 1993 so I don’t think Honda will have a fairing stay at that price now.