This thread
http://forum.a8parts.co.uk/showthread.php?t=704
gives you the basics of what you'll need as long as you ignore the p1ssed off bits when nothing worked
.
You can pick them up from about £80 second hand on Fleabay and they are a cracking bit of kit when its hacked.
I'd like to know what Tony has in mind as a substitute for it though.