I found this in my notes from some time ago. I snagged them from a 1911 site. Have no idea which one it was. Now this was refering to the Llama Government .45 model but I'm 99% sure it applies to the Firestorms too.
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The following parts fit with no modifications required:
Extractor, recoil spring, guide rod, recoil spring plug, firing pin stop, magazine, hammer, hammer strut, hammer pin, safety, sear, sear pin.
The following parts fit with some modification:
Barrel bushing, barrel, firing pin, magazine catch, grip safety, slide stop, trigger, sear spring, disconnector.
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It is closer then I remembered but still not 100% compatible unless you get a gunsmith involved. If I'm wrong (and I frequently am) I'm sure someone will point it out.
Regards,
Warm Bore