These are the handling.cfg settings for right-hand drive cars,
You need to open the file settings.txt with a notepad, and enter the name of the car in an empty space and save.
Attention, the names of the cars must be in the GXT record, example:
ADMIRAL
ALPHA
BANDITO
BANSHEE
BLISTAC
HOTKNIF
GREENWO
ZR350
You can see more details in the handling.cfg file itself.
The mod requires a Modloader.