Are the originals domed head rivets?
http://www.mcmaster.com/#domed-head-rivets/=10o0eq7
Scroll down to "Solid Rivets". If these will work you can drill a hole in the end to make them tubular rivets. Are the new/old one tubular rivets? You can also bond the lenses on and bond the old heads in place to look orig. But I'm sure we can find proper rivets. just show me the profile and give head size and length.