Svenn, when we received our truck there was just enough material left in the mud flaps to get dimensions. The fronts are 12 1/4" wide 312mm by 7 1/2" deep 191mm. Rears flaps are 19 3/4" wide 501.65 mm by 12 1/2" deep 317.5 mm Please find photos enclosed and I hope the conversions make sense.
Sorry, I just realized the front one is upside down but you'll get the idea.
Rob