They pretty much just pull right out once you have the fuel rail loosened. I have never gone to the hassle of replacing them though. Not that it is a bad idea, I just have never had the need to. You pull those fuel rails often enough on the white engines when you are doing oil trap boxes and intake gasket and the like and I have yet to see a tech replace the injector seals. If you are wondering if they are leaking just spray them down with a little brake spray clean while the car is running, if you have any change in the idle quality of the motor then you need them. The engine management system is pretty sensitive to air leaks on that car, if you had much of an unmetered air leak from the injector seals I would think that it would bring on a check engine light. Now if they are hard and brittle then by all means change those suckers out, but I find that they are usually fairly soft.

Mark