Gmod Mounting CS:S

Hi, I recently downloaded gmod9, it’s fully working. I have gmod 13 but I’m playing gmod9 just for fun but I’m wandering is there any way to mount cs:s and hl2dm content? Maybe something with gameinfo.txt?

I’m launching gmod9 using Source SDK Base 2006

I think it only supported GCF mounting back in the day, so you’ll just have to drag content manually.

maybe, thank you for help