Wurth do a standard silver paint which matches the paint used on alloys by most manufacturers, which is excellent if pricy. In my experience, Holts silver/aluminium is a close enough match to be un noticeable.
Hope this helps m8.
Becuase all five wheels need new tyres to complete the 504s restoration I am going to get them sand blasted clean. Would like to get the colour spot, so I can spray them before having new tyres fitted.
Wow, should look sweet when it's done. If you're getting them blasted (though sand blasting soft alloys is a bit harsh) then any wheel refurb shop should be able to match the paint, as well as do the stripping for you. Reckon on about 30 or £40 a wheel, but worth every penny in the long run.