Vacuum diaphragm for cruise control needed

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Im looking everywhere on the internet for one of these for my 77 Grand Prix, if you have any clue please let me know thanks
 
Is there a part number on the box?
I dont have the box, The old part does not have any part numbers, or brand on it, it mounts on the intake manifold and connects to the throttle linkage. Its 5 1/2 inches diam. and has one 5/16 vacuum hose connection. Thanks for asking.
 
So what is the first picture, a generic picture showing a box?
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This is the actual part off my car. That box thing on the fender controls it.
 

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This is the actual part off my car, the box on the fender controls it.
sorry about the first pictures i borrowed from ebay
 

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    20250718_172802.webp
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I was referring to the cardboard box in the first picture.
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