Cadillac CTS-V - Where on the car can I find...

I feel dumb posting this but I'm tired of looking and haven't had much luck...

I need to replace the sensor that's in the charcoal canister on my V as it's been throwing a CEL and the gas cap and evap solenoid are new. I haven't had luck finding where that canister is located...I thought I had read that it was in the rear wheel well on the passenger side but I had that off while changing brake pads this weekend and saw nothing obvious...

Here's a link to what I believe the canister is for our cars and you can see the specific solenoid in the 3rd pic: http://www.ebay.com/itm/180815660948?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

eBay Item Number: 180815660948

Thanks for any help!

I have an 06 Ls2 car, so hpefuly it is still in the same place.

Jack up the rear of the car, look up kind of to the back of and off to the right of the differential. It is in front of the trunk pan. When I saw it the thing looked like a PITA to get to to replace.

Hope this helps.