ahh, yeh it was an absolute bitch to get off... had to get under the car, squeeze my hands in there somehow, than got my bro to pass me a hammer from above and slowly knocked it out. there's no easier way from what i can see, just need a really skinny and long 17mm spanner and patience i guess.
my local tuning shop quoted me $50 to install the whole lot in to the car so that's not a bad price i guess, just i needed it done the night before a track day.
good luck with it!