Any mention of "stock" was with regards to size only - not to the interchangeability of components.

And while I won't argue with you, I honestly find it hard to believe that someone would make an undersize chain. While it would be simple to machine an additional .010" in a sprocket's diameter, to make a (for example) .005 undersize chain would require each link to be "stanped" with an unbelievable tolerance. For example, there are approximately 72 links. Divide this into the .010 and you end up with each link having to be roughly 1/10,000 shorter than standard. Or alternatively you can make the rollers that much larger. I just can't see it!

Anyhow, give me an oversize sprocket any day!