how to install skins for the cart 1984 mod

[gray man]

recently i got the cart 1984 mod and saw some extra cars available for it do you know how to install these?

 

[Avalaya]

Copy paste? Show me extra cars file

 

[gray man]

i put it in the all teams section. also what dose extra cars file mean.

 

[gray man]

Also the mod has a error with a wing texture

 

[gray man]

can someone get ahold of chief wiggum