Poly Cone / Polyseal replacement caps

I've been wanting to replace the caps of my amber bottles (950ml) Does anybody know the size of those? What do I measure the diameter of the opening of the bottle or the cap itself? There are so many options https://www.thecarycompany.com/containers/closures/plastic-caps/polycone and I can't find any information.
Thank you!

I called Photographers Formulary and told them the capacity of the bottle and they sent some that fit like the originals.

I believe they're 33/400. The Stearman Press SP445 uses the same cap size as the 1l (950ml?) amber bottles
https://www.thecarycompany.com/plastic-phenolic-cap-30w33c

Dani said:

I've been wanting to replace the caps of my amber bottles (950ml) Does anybody know the size of those? What do I measure the diameter of the opening of the bottle or the cap itself? There are so many options https://www.thecarycompany.com/containers/closures/plastic-caps/polycone and I can't find any information.
Thank you!

Click to expand...

https://www.fillmorecontainer.com/33400-ct-black-ribbed-polycone-lined-phenolic-cap.html

38 cents a piece. 33400 sounds correct but I would double check.

I've bought phenolic lids with the PE cone liner from these folks in small quantities before. A friend drinks horrible cheap wine, comes in beautiful 4 L glass bottles. I bought some of these lids, very nice quality, but not the Original brand of Polyseal.

Thank you so much everybody! I'm excited to replace those old stained caps.