Fred is no longer casting, he had a stroke a few years ago, and I believe eventually passed away.
As far as sources for fire apparatus stuff.
The Scale Firehouse has lots of info and an active forum.
http://www.scalefirehouse.com/
Models by Dave has already been posted. He has several truck cabs including some fire apparatus, a Ward LaFrance, American LaFrance Century and a Ford C canopy.
American Industrial Truck Models (used to be Model Truck and Fire Apparatus Company). Many truck cabs and a couple of fire apparatus cabs including a Mack L and Mack CF. If you download the catalog he also has a bunch of white metal or resin parts for fire apparatus.
http://www.aitruckmodels.com/
SSB Resins is another with some stuff for fire apparatus. Kind of pricy but nice stuff.
http://ssbresins.com/