The widest part on the pistol is at the base of the grip where there is a slight magwell flare. The width is 1.382" on my pistol.
On the mags, you will have to call them. Unless you find para mags, you probably will not have any luck locally.
If I remember correctly the mags are $35.00 each shipped. Mine work perfectly. I sent a check and received the mags very quickly in the mail.