I'm in the middle of swapping injectors and noticed that the bottom side of the old injectors are a bit different from the new ones. There is a cap over the bottom of the old injectors. The new ones don't have the caps. The old injectors are 36lb blue tops being replaced with Delphi 51lb. It's been about 15 years since I've changed injectors out so just want to double check and make sure everything is good to go.