I've picked up some new injectors plus new o-rings, and grommets. Will I need any other replacement parts while I replace my injectors?

 

Nope but be sure to lube up the orings and grommets with some oil before putting them in so they dont tear. Also when putting them into the rails use a gentle twist and push motion or you could pinch an oring and leak fuel everywhere. Be sure to check for fuel leaks before putting your UIM back on by jumpering the yellow connector for the fuel pump.