RS2 brakes onto 200

[e2e]

Dave Eaton has put new upgraded brakes on his RS2 and has offered me his old
porsche/RS2 brakes.
So what issues are involved in fitting them to my 1990 200TQ avant?
What brakes are on my car now g60 or ufo and how do I identify them?
What brakes are on the RS2
He has only got fronts available is this a problem with RS2 fronts and std
rears, should I source some other rears?
RS2 has 17" wheels will these brakes fit 15" or 16"?
-- 
Sam Clarkson