I don't have a Mac (wish I did) but maybe someone will know the answer. You are still to tall with the 2 pita pata. My siggy is 500 x 200. With my blinkie it is 600x 200 so I would have room for 1 pita pata or 2 mini ones side by side.
Here is thread that goes over siggies with pita pata
How to know siggy size??