The dealership tried to charge me 36$ and some change for 4 tiny o-rings that go onto the injector tops. These are commonly torn when people change their injectors.
After some research and looking around at my favorite site mcmaster.com I found that the 8mm ID by 2mm thick o-rings are an exact match. Part #9263K169. These are the ones made out of Viton which are the oil/gas resistant kind.
I also tested out and found that the 7mmx2mm are better because they fit more snugly and have less of a tendency to tear during installation. I did test this and I'm currenly running it on my car.
A pack of 25 is 9$ which is what they were going to charge me for one!!!
Edit: Also you usually get them overnight through their regular shipping.