Just add the dlc's folder name into dlclist.xml
<Item>dlcpacks:/southxwheels/</Item>

After this you will find it with the help of Menyoo in Wheels -> Sports -> SouthX Rapid

Discord here: https://discord.gg/UBWpguEZqK
Website here: www.southeastcustoms.xyz

Credits: Me a.k.a Urban1st a.k.a South East Customs a.k.a SouthX (Of course!)