I think that is the early US type bumper as the euro ones did not have the bumper ends that extened as far to the wheel well. I personally like the longer ends and can see where others would as well. Now the US bumpers from 74 on were terrible. You can see the difference on Yannick's pictures of the blue/silver 02 Alpina.Correct me if I'm wrong, but I thought from the original post that this car is in Austria. Not sure were all the US bumper talk is coming from, as that's a euro bumper in the rear (admittedly with some big bumperettes).
The rear bumper is Euro. It has the lic plate lights in the bumper. The US - countries that had narrower plates didnt have the lights. They had the lights on the rear panel.
Plus the set of lights under the tail lights were Euro, RE the bright FOG light.
However the Euro cars should not have the side markers, but a US car would of had the big bumpers. However they are easily swapped out.
Its a cool looking car. I think it be worth fixing..