Rmm20200

I have a 2010 audi a3 with curved xenon headlights. These headlights are ridiculously expensive and I bout a pair of headlights that fit my year of audi but they are w/o curved lighting so the housing and wiring are different than mine. I have been searching every nook and cranny of the internet to figure out what kind of bulb goes in these and the ballast I will need since it only has 1 wire for the ballast instead of 2 like my old headlight. Does anyone know the answer to this? It seems as though no Audi's my year where built without curve lights so why sell a factory replacement that has no curve lighting and the bulb for it doesn't exist.