Headlight ballast gone bad (would this work)

Hey guys, so lately my passenger headlight would sometimes work and sometimes not. The bulb was new so i figured that wasnt the issue. last night we swapped the ballasts on the headlights and the error moved from passenger to driver. So looks like i need to replace it.

A buddy of mine can get one for me for 370 new but then i found this.

http://www.ebay.com/itm/AUDI-A3-S3-A4-S4-RS4-Quattro-Hid-Ballast-Xenon-Headlight-ECU-Control-Unit-2004-/151079042581?_trksid=p2141725.m3641.l6368

This is would work ok right?