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All steps

1		Create folder called 02_truck_accessory.
2		Inside 02_truck_accessory create folders: mod_accessory - where you will put the new resources base - for existing game resources which you will use
3		Inside mod_accessory create folders: def vehicle truck renault_mangnum accessory f_grill
4		Inside /02_truck_accessory/mod_accessory/def/vehicle/truck/renault_magnum/accessory/f_grill create file called custom_g.sii which will contain definition of the grill. And paste there the following example definition: SiiNunit { accessory_addon_data : unit.name { name: "My front grill" price: 1 unlock: 0 icon: "f_grill_09" exterior_model: "model path" } } And keep the file opened.
4		Now change definition as you want: "unit.name" must be set to some unique value - each component divided by dot can have max 12 characters. For example the good name will be custom.amazing.renault.f_grill The name is the name of the accessory in truck configuration screen. You can call it in any way. The price is a price of your accessory in game base currency (€ for ETS2, $ for ATS). The level when the accessory is unlocked. If zero it will be unlocked immediately on game start. The icon is a image that is displayed in truck configuration screen. We will leave the image at the moment as f_grill_09. The exterior_model is a model of the grill. It must a path to the .pmd file you will get after converting the data. So for this it will be: "/vehicle/truck/upgrade/frontgrill/renault_magnum_2009/custom_grill.pmd".
5		Inside mod_accessory create folders: vehicle truck upgrade frontgrill renault.magnum.2009
7		Inside the base folder create folders: material environment
6		To the environment copy generic_s.tga and vehicle_reflection.tobj files from the BlenderTools-1.2\data\sample_base\material\environment folder which you can find in the folder where you extracted SCS Blender Tools.