How about JASO MA2 specification for oil which is intended for clutches that run in oil …
I get to answer myself when I found the answers here
https://yambits.co.uk/oils_parts_for_yamaha_xs500.html
Have you tried You tube?
Lots of XS500 videos, too many for me to view, but I notice this blue one has the same size font on the side panels as your photo of the black one.
it maybe a case of going through them as some may have the correct tank but not side panel and visa versa.
Thanks for the replies. I have the parts catalogue and depending on the colour the part code will be different. The only thing that seems to stay the same is the code stamped on the underside of headlight bowl and as I'm doing a total restoration it doesn't matter to me what colour it is as I will respray it anyway. I have a Yamaha at2 also and that has a code YHA 11 SAE M68 so I was hoping that the missing headlight would have a code of some sort.
Thanks for any help
Julfra