Will a #7 stopper work for 6 gallon carboy?

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Ok. Everything i was reading was saying 6.5 stopper for a 6 gal carboy so i wasn't sure. Thanks
I would believe your research. I don’t know if every 6 gallon carboy is the same size, but a #7 stopper won’t fit in the one I have. See photos.
A1563186-0F69-462F-A2A7-515EDAFDBFD4.jpeg BA15A09C-73AD-4FCF-AE79-88E48CDCD60A.jpeg
 
The neck on that carboy doesn't look anything like mine which are ~15 years in hand.
Is that one notably old, perhaps?

Cheers!
 
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