Xbox 360 slim- Need Help?

hi, i was hotswapping my xbox 360 slim 250GB for waw iso mods like i always do, But i dont have the proper tools, i use a pair of pliers to unscrew the motherboard shield because i have NO screw that fits it. And i did it but it got really REALLY screwdged (all messed up) Do you know if the same model screws are for sale at any local stores?