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 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. there main site, the download page of the mod also 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.