Yes. The #530 is the right size chain.
As for the number of links, I'm pretty sure your C5 with the 18" rear wheel uses the 102 link chain.
I know my G5 with the 19" rear wheel has a drive sprocket that is one tooth smaller than the C5 sprocket and it uses a 101 link chain.
That 101 link chain is a bastard size as far as the chain makers are concerned and it needs to have a "half link" installed to get the odd, 101 number of links.
Just to be on the safe side though, count the number of links in your chain. It goes pretty quickly if you put the motorcycle on its center stand so the rear wheel can rotate and then start counting with the master link being #1.