Go to mod folder (or zip file) of your mod truck.
Go to " def/vehicle/truck " and see what your truck mod folder name is.


Go to my mod folder, go to def/vehicle/truck folder


and make new folder for your truck mod


Inside the truck folder, create /accessory/toyseat(or toybed)/


1.Inside toyseat(or toybed), copy .sii file from other folders and put it here.
2.Change these lines according to your folder and file's names.
3.Left there line as it is
4.If the variant is not default, change it to default


And you are done