Searched a few different keywords and came up with this:https://www.ebay.com/itm/Cardone-Industries-53-5936-Remanufactured-Power-Brake-Booster-W-O-Master-Cyl/323466711714?fits=Model%3A280SE%7CMake%3AMercedes-Benz&epid=76649727&hash=item4b501e52a2:m:mWaReXfFX6qB5tiJLTgouEw:rk:1:pf:1&frcectupt=true
Anyone have experience with Cardone?

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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