"here is a easy solution, get a -a12 rotor disy an take out one pick up an fit to your motor. easyer than the other rubbish"

Crank angle is more accurate than cam timing but if the 13B rotor dizzie works the go for that, The common rotor CAS dizzies for ease of sourcing, first came out on the S4 13B and not the 12a rotors (Im sure you meant not a12 :) as most where all dizzie with coils.