Cars Adding car to existing mod

[mattrans]

Hi guys, I'm looking for a bit of help and any info would be great. I have downloaded the BTCC mod, and I wanted to know how I can add a differend car to this mod. I have downloaded the Seat Leon Cupra car and wanted to be able to use it in the BTCC series. What files would need editing so this works ?

I have copied the ui_car.json file from another BTCC car into the Seat Leon Folder, but AC crashes when loading.

Any ideas where I am going wrong ???


Thanks