The original BEHR unit had a blade type fan not the dual squirrel cage fan. The squirrel cage fan is most likely more efficient and quiet than the original. It's hard to imagine enough of a market to reproduce these, especially at the price. I have seen original BEHR units for $5K.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT