your DAF truck Eberspacher heater will have a specific internal ECU and wiring harness to suit the DAF cab heater controls. It's very possible to install a latest generation Eberspacher M3 D4R Heater but you'll need to independently connectit to the Eberspacher controller, not use the DAF harness but install new. if this is something you're interested in please email our Technical Team - sales@butlertechnik.com
just mention this message reply. Really it would be about getting the best price to you for a full Truck install kit in my opinion, you'll need the 4 x core items of the kit, the heater, the wiring harness, the fuel pump and the controller.
Regards
David