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

Move it to your Documents\Euro Truck Simulator 2\mod folder.

Bumper lips, roof bars, and the signature EKO backwall piece for Scania S/R and DAF 2021 models.

It unlocks parts across all brands, effectively allowing "the tuning of all trucks" as your title suggests.

Search for the "Tuning All Truck & Trailer Package 1.46" on platforms like ETS2Mods.lt or the Steam Workshop . How to Install the "Piece" Download the .scs file for the mod.

Many users specifically search for the "backwall piece" from the mod, which was a major update for version 1.46. This "piece" allows for detailed interior and exterior back-of-cab customization for Scania and DAF trucks.

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.

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)