UPDATE: CSC just told me "those sprockets only use a 428 chain, the 520 does not fit". Given that I go with their 17 and 45, which is what I'll probably do, so I think I have that part figured out.
Lastly, the chain. Looking at 428 X-ring chains, I come up with these two (at just this seller). Am I on the right track here?
https://www.rockymountainatvmc.com/p...x-ring-chain-p
https://www.rockymountainatvmc.com/p...series-chain-p
Am I correct in thinking as long as I have MORE links than needed, I'll be fine and can just remove the ones I don't need? I did acquire a chain breaker tool.