Is this the correct socket for my impending injector replacement?
http://buy1.snapon.com/catalog/item.asp?search=true&item_ID=10720&PartNo=s6128&group_id=1326&supersede=&store=snapon-store&tool=all

yes, but a 30mm deep impact socket will work and costs about ~$15.

The snap on has a 7/8" nut on the back . Makes it alot easier especially on the pass side.