Chris, I work on D's also but not as much as some others in the group. But some rubber parts I replace just because rubber hardens over a period of time. I replace all the rubber bushings around the injectors when I'm working on my car's or someone elses. It's cheap insurance. When you take the clips off and take the injectors out, the rubber will be normally as hard as a rock. You might use gentle pressure and break them off. You can replace with Bosch 2-430-329-002. If you can't find them locally, I have them at $4.00ea. Back track from there. Good Luck. Ps:Please don't drop something in the holes.Then you will have to burn out or clean. John, Dherv10@xxxx vin11004,06935,06568