Modifying ford 150# injectors to fit DSM

[carltalon]

I just picked up a set of ford Racing 150 pound injectors for my car. I know I have to either turn down the tops or drill out my fuel rail to fit.

My question is. what are people using to make the bottoms fit into the head properly? The ford o-ring is smaller then the DSM one.

And, Do I need to do anything to space the injector between the rail and head ? The dsm injector has a rubber spacer between the Fuel rail and the injector body.