I need help with missing content in Garry's Mod 9.

[themurderfrog27]

I though this would be the best place to ask for help with this. I'm missing CSS/HL2/HL2: DM/HL2: EP 1 content from the game. I have all 4 games in question installed, and all of them have been run before. I've heard that post Orange Box games are incompatible with the mod, so I'm wondering if anybody has content packs/older versions of these games.
I'm pretty poor at the moment, but I'm willing to give away a few CS:GO skins to the person that helps me.