If you are looking for the mod that allows you to put (e.g., Scania lights on a Volvo), you are likely looking for a "Tuning All Truck" package.
You can often find this on the SCS Software Forum or dedicated mod sites like ETS2.lt. 2. "All Truck Tuning" / Tuning All Truck & Trailer Package AZ Г–SSZES teherautГі TUNGOLГЃSA 1.46
Based on the version and the request for a "piece," there are two primary mods this usually refers to for the 1.46 update: 1. EKO Truck Parts (Backwall Piece) If you are looking for the mod that allows you to put (e