1981 squirt baseball sheets?
 

I have the complete set of 1981 squirt baseball set. I'm looking for sheets that they will fit in. I've seen 3 pocket pages that fit these.

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This seller on ebay offers something like I think you are describing:

https://www.ebay.com/itm/A4-Cosmic-M...CA2E35m3sbYRiw

I can't say I have ever seen a vertical 3 pocket page in person.

Edit to add: From the description it appears that the vertical 3 pages are made for bookmarks if that is helpful in the search. There are a couple of other listings for vertical 3 pocket pages on ebay in which the columns seem too narrow for a baseball card, so make sure you know your dimensions I guess.

For stuff like that I use 1 pocket pages, and use double stick tape or gluedots to turn into a 2 pocket page.