According to 'Squadron/ Signal No.19: Focke-Wulf Fw 190 in action' :
Rüstsaetze (Field conversion kits)
R1: One WB151/ 20 gun pack under each wing (Fw 190A-6/R1, Fw 190A-7/R1, Fw 190A-8/R1) - also A-5/U-12 (2 versuch aircraft, not mentioned in the Squadron book);
R2: One MK108 30-mm cannon under each wing (Fw 190A-6/R2, Fw 190A-7/R2, Fw 190A-8/R2);
R3: One MK103 30-mm cannon under each wing (Fw 190A-6/R3, Fw 190A-8/R3).
I have a few photos and drawings of these arrangements, drop us your address in a PM and I'll post them to ya.
Evan