Two part question..

okay so I need replacements for two parts on my '95, the first is the light located on the side of the car on the rear fender (lights are cracked on both sides)
http://img190.imageshack.us/img190/9650/light4hh.jpg
the other is the plastic piece that is found behind the headlights to keep water from running down into the engine (it's missing on the other side)
http://img190.imageshack.us/img190/5048/light11wc.jpg

These are easy enough to replace but I need to know where to get them, I'm guessing they have to be ordered through GM or through an auto parts store like pep boys..

Most likely GM.
You can get ahold of Fred Beans. They are a dealership in PA that give much better prices to LS1.com members. Probably save you a little bit.
SDPC (Scoggey Dickens Parts Counter) might be able to help you out as well.

You are gonna have to google them though...I don't have the info off hand.

Or.. you could try a junk yard or ebay. Those are the first 2 places I always go for replacement parts, heck of alot cheaper then brand new parts.

a great junkyard for 4th cars is "International Auto Wrecking". Ask for Jack- super nice guy. (818) 896-5241 They're located in Los Angeles area.