Ripping Custom models from a game.

Theres this game i play called Street Legal Racing Redline, theirs some awesome custom content that some people make for it. Specific site of interest www.street-legal-mods.com/ theirs a group called magnum force that create custom muscle cars for the game. They have almost all cars by dodge from the 60’s and 70’s , but i would mainly like to know is it possible to rip the engine block models they have, along with cylinder heads oil pans, ect. http://legalracer.net/load/28-1-0-224 there main site, the download page of the mod also
http://legalracer.net/load/0-0-0-224-20 the download link

Im not sure if it will work, the sites in russian also.

It would add tons of awesome custom content to garrysmod if someone could figure a way out to rip these to garrysmod.