Help identifying UFO replacement brakes

[Bryan Kamerer <kamerer@concentric.net>]

        I am looking at a used Audi that has had the UFOs replaced.  I am
trying to identify whether they used the Audi supplied kit, or S4 brakes, or
what.  Service records for the swap/change aren't avaliable.

        From what I can see the disc looks none too big, solid not vented
(can't get at it to measure without taking off the wheel).  There is no
piston visible from the outboard side, and the inboard side is hidden by the
backing shield.  Does this sound like the kit/5000 brakes?

        Steering was crisper and braking about equal to other UFO-equipped
cars I've driven and owned.

        Any feedback would be appreciated.

        Bryan