The only EAA mags your BP6C will take are from the small frame Witness, the current Witness compact mags won't fit.
At the range I use mags from my CZ 75B, Canik 55 Stingray, and Me-Gar for CZ75. All fit and function fine. Some are longer and just stick out the botton, but are fine for the range.
The SAR mags from EAA are #170821.
There is a section on the forum you should check out. A little bit down the page you will find "CZ Clone Club", your SAR is in this section. Lots of posts on the B6PC that you will find helpful.