Austin, I can only suggest that you try looking in the classified "for sale" section of such publications as "Heritage & Vintage Commercial." The FG does appear from time time.
I remember a company called Dallas Recovery down in the Dalmarnock area of Glasgow having this vehicle as an air cushion recovery truck. They also had a couple of other gems aswell as quite a few classic cars tucked away in the building they used.
Added by Ian Mac on 07 March 2009.