Date registered: May 2007
Vehicle: 2003 Mercedes Benz E500
Location: San Francisco Bay Area
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that brings back memories. Anyway, the original manufacturer, I believe, was "Figi-King," the same folks who made refrigeration units for cargo containers and road-going refrigerated trailers.
The installations, with some exceptions, were actually "depot" and dealer installations from a "kit". The kits, were still available in the mid to late 1980s, but I think they would be an extremely rare find these days.
Your best bet is to scour wrecking yard resources, and hope for the best.