Hello, I was wondering if the A4 and A6 headlights fit with each other/ were interchangeable? I got a '99 A6 Avant Quattro like a week ago and want to get new headlights for it, because the current ones are really foggy and look like crap. I've known about the Halo headlights, but when I went onto CariD, they only had LED strips and Xenon bulb kits? So...yeah. I'm basically wondering if I could use an A4 headlight, and put it on an A6 without any issues. Thanks.