There is no parts Kit.
And, there is only sort of a consensus on the minimum Parts to replace.
Does "knocking it out" mean you already have the Chain Crimping Tool in hand?
DIY Repair Links
http://www.peachparts.com/shopforum/diy-links-parts-category/
http://www.peachparts.com/Wikka/DoItYourSelf
IWIS Chains are clearly better quality than the other makes. There is a nice thread somewhere showing Pics comparing a Japanese (Beck Arnley?) Chain with an IWIS.