That sucks. Usually thieves in that area go for the Civics, Corollas, or any common Japanese car. FiSTS are never on any list of commonly stolen/ broken-into cars. My sister's Corolla has had more parts stolen from it (even the BATTERY) than the two Mustang GTs, the FoST, and the FiST in my family.
So how does one go about unmarrying an AP one doesn't have? Or could another AP be made to work with your car?