[s-cars] changing '92 "UFO brake setup"

[willem.smit]

Hi,

I want to change the UFO brake setup of my '92 S4 avant for regular ones. I understood that I need to replace the whole strut and then exchange the shocks/springs back. I ran across 2 options one setup from a '93 V6 and the other from a '94 V8 C4 (audi 100). I've never done such a swap. So I have some Q's. Will these fit? What things to check before buying? What things to bear in mind before swapping? How to proceed when swapping.
Thanks.
Willem