a pair of unrelated questions that need answers ASAP
 

Well, okay, only one does, but the other would be nice. The important one first: What size is the O-ring that goes on top of the fuel injectors (s5, but I assume that they are the same across the board)? Second, does anyone know where I can get dimensions of the rear subframe and diff mounts (the one's made out of delrin, being that I want to make them out of aluminum)?

Thanks!

Well, to answer the first question, if you go into an injector shop or your average tuner and tell them you need some injector O rings....they will have them. They are pretty much all standard.

As for the 2nd, you could try jacking the car up and measuring them? Other than that, I have no clue.

Right-o. Got the o-rings, no problems there. The problem, though, is that I can't get the exact diameter measure with the metal plate on the bottom of the mounts, and I want a setup where the aluminum is press fitted in. Thanks for the help!

Try PMing the guy who sells those bushings in the for sale section for the dimensions.

^ Dude! there's a guy who sells the bloody things in the for sale section!? SWEETNESS!! Thanks man!

check ebay too.