Importing Stuff from Different Account into Garry's Mod

Once upon a time, in the year 2004, I had made a Steam account with only Half Life 2 and a little game called Garry's Mod. One year later that account was not being used anymore, but not shut down.

Eventually I forgot about it, and I made a new account for the Orange Box. Upon getting it I remembered about my old account and decided to get it up again to play Garry's Mod. I soon realized that Orange Box means more props for Garry's Mod.

Unfortunately, they are now separated by two accounts. Is there a way to get maps, props and all that jazz into Garry's mod from a separate account?

Try gm_mount2
That might work.