Here is a D.I.D. 520ERV-7 Race 520 pitch gold chain. It was used on my previous ZX-10R 2009 for a bit of road and track use. Removed when I put the bike back to road trim for selling. I've bought a new genuine rivet link for you to refit. Is 100 links long as used on a ZX-10R Gen 3, but doubltess fits R1s, R6s, GSXRs and Fireblades - but please do your own research on the length required. Grab a bargain over new, I have seen these on sale for £170., so this is half-price.
eBay