GSC 2013, Only have v8 stock cars. how to install mods?

[Weasel]

I can only drive the v8 stock cars, and i dont see the mini formula reiza etc in the game at all.

And how do i install mods for GSC? every mod i download doesent have a readme. i tried just putting them in the corresponding folders but that doesent work.

 

[Justin Swan]

Look for the arrows to the left and right of the stock car image on the main screen.