2007 Audi A6 3.2L Quattro steering knuckle and control arm help
 

I needed struts in the car but the driver side steering knuckle is bad and the bolt won't come out so I am not able to put the strut in and I needed to buy two upper control arms what is the best brand to buy don't want to pay dealer prices. And I cannot find the steering knuckle anywhere new only one on eBay does anyone know where I can find one thank you.