Hello!

Dismount the distrubutors, don´t worry then will only fit in one direction, (yuo can´t change the timing).
Brake the old glued rotors whit a hammer :-) .
!!! I have not tried this myself so please report if it works or don´t, of course!
(I have heard that old Ford OHC 2.0litre rotors will fit as well.)

Audi V8 4.2 (Panther Schwarz 92)