Erick,
I would consider going to
http://www.crutchfield.com and picking up a single DIN adapter from them. I had a similar issue trying to install a single DIN head unit in the stock location and ended up buying from Crutchfield instead. The kit I purchased worked perfectly and even provided me with some extra storage area for things like my "smokes", garage door opener, lighter, and head unit remote. Best of all, it only cost $20. Here is the link:
http://www.crutchfield.com/S-O...=3121
Good luck,