Welcome to the site !!
The stock chain I believe is a Renthal , as that is generally what Honda uses but it could be a DID , but just because it is a Renthal or DID does not mean it will fit , as they make different widths , etc. , what I would do is take the chain itself (if there is no link then you need a chain breaker) and/or the stock link to your local bike shop or Honda dealer , larger dealers usually have chains and chain links in stock , you can then match the link to your link , or the new link to your chain ...... that would be the best bet .....
Only other option is to buy a "new" chain , and order a extra link or 2 for it ......unfortunately , with chains , they are usually different , I have 5 or 6 chains laying around , and each one of them requires a different link (I can't swap links between them) and most of them are DID ...........
So you may end up having to just replace it , so you can achieve what you want ...... I also carry extra links , I buy 120 link chains and 2 links , that way , if I want to change gearing or the wheelbase (changing wheelbase by putting the wheel all the way forward or all the way back allows handling characteristic changes like more/less cornering or more/less traction) , I can use the leftover piece of chain , and the extra link , cut it to the link number I need and add the link with the larger sprocket ..........