[JPflip509]

I have a 2011 328i xDrive sedan. I am planning on lowering it with H&R Sports+Koni Yellows. My concern:

I saw on the Suspension forum the part # for H&R Sport Springs are 50490.
I see some websites have 50494 or 50492. Is there a difference between xDrive springs, or regular sedan springs and even coupes?

Which is the one I need and if there is a website you have as good as Turners Motorsports, please provide. THANKS A LOT EVERYONE!