When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I think its safe to assume that they are stock unless you have good reason to think otherwise. People don't just change injectors unless its a turbo and modded. If you really want to make sure, its not too hard. Look in the FSM for instructions.