75888 Rijkspolitie Mod of green 911 (930) to 911 G-Modell
Did put the windshield one row more to the front. Think it looks better then. Sadly the slopes originally used are not aviable in trans clear black. That would be nicer.
Maybe you have a better idea.
Partsvalue about 15€. If you habe the white and orange porsche from the 75912 set, it should be easy to do a similar modification in order to get the 964 Targa in Police colors.