Colour matching for for GSXR wheel swap

[nurse]

I have a 1990 suzuki gsxr 5.5" rim i have just dropped of to my local body shop and they are going to prep and respray to match the original front on my 1992 3xw. 
They are quite happy to manually colour match using 'colour cards' but I wondered if any one on here knew the colour code for the wheels off the top of their head??  I have searched and found lots of codes and colour names on the site, but none were listed as '1992 Fj wheel grey!!' so was a little unsure. 
Looking about all of the later models i have come across seem to have the same colour wheels in the uk!

Any help would be much appreciated!

[nurse]

Following an intense session of google bashing i found a reference to 'Hi-Tech sliver' on a parts list for the front & rear tyres.

Mean anything to anyone?