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According to the factory service manual the bars are as follows:
S4 w/o harder suspension: Front = 22mm, Rear = 13mm
S4 w/ harder suspension: Front = 24mm, Rear = 13mm
S5 w/o harder suspension: Front = 24mm, Rear = 12mm
S5 w/ harder suspension: Front = 24mm, Rear = 14mm
So for the rear it would seem that there are 3 choices: 12mm, 13mm and 14mm.
I'll usually check the FSM for stuff like that, as it's full of useful information.
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