My 911.50 has the following OEM wheels;
Front: 20"x9" ET51
Rear: 20"x11.5 ET48
I can pick up a set of wheels from a WB 997 with the following specs
Front: 19"x8" ET57
Rear: 19"x11" ET51
I would use these exclusively for AX and maybe an ocassional DE. The difference in offsets has me confused...