I have done this in my SV6 and installed VY SS pedals. I ended up taking it to a dealer and got them to work it out. Cost me a fair bit in parts and labour but was well worth it in my opinion. Took them about and hour I think to install... which for me would probably have been three hours and a lot more frustration.
Try these threads... they may be of some help.
SS Pedals
SS Pedals on a SV6
The pedals look great and are so comfortable to drive with in bare feet so I am stoked I decided to do it.