Does anyone have a internet-adress , where i can buy nice 4 (or5) inch headlights, chrome?

Try these...
http://www.holden.co.uk/displayProducts.asp?sg=1&pgCode=010&sgName=Electrical&pgName=Lighting&agCode=0010&agName=Headlamp+-+Freestanding

http://www.s-v-c.co.uk/category/freestanding/

Great  thanks....

look for bates headlights/harley headlights/chopper headlights,

look for bates headlights/harley headlights/chopper headlights,

Trouble with many of the Bike headlights out there is that many of them do not appear to have the correct beam pattern when dipping high and low and do not kick out to the side like car ones do.

Not been an issue previously for many MOT guys, but not sure how SVA guys would view them   

The OP's in The Netherlands as well so...