Hello MrandMrsInger! You can purchase a new replacement foil for your Braun 370 at the link I've provided below. Basically, you'll be getting a new cutter block and foil for it, as the foils are no longer provided separately.
Braun, now owned by Gillette, discovered that many folks would buy just the new screen (foil) and it would get torn/damaged by a nick in the cutter block blades, so they packaged these wear items as a set to eliminate those very common problems. I had it happen to mine several years ago, so I know why they made the change.
Anyway, here's the website with your replacement parts:
http://www.electricshaverstore.com/get_list_125.htm
Just scroll down to the 2nd item shown, I believe, and you'll see your replacement set.
You can also use the part numbers to try to locate another supplier, if you wish, as these are the actual Braun part numbers provided.
Hope you find this Very Helpful and best regards!
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