This mod adds the retro steering wheels from the Holland Style Tuning Pack to the DAF XF105, Iveco Stralis & Stralis Hi-Way, Mercedes Actros, Renault Magnum & Premium, and Scania R 2009 & Streamline.
You can also add the DLC's horns to all trucks' (even modded ones') light bars and "under the frame" (i.e. steering wheel attachments). I attribute the latter idea to Drive Safely from their Sound Fixes Pack (which I highly recommend).
Warning: Because many of the trucks affected by this mod were built using archaic methods, you may notice visual issues, such as steering wheels clipping into the base. From what I could tell this only really affected the Stralis. Y'know, the one taken pretty much straight from German Truck Simulator. All defs refer to the steering wheel mesh data included in the DLC.