I've got two of these, one with glass and one without, both of which have openings of 3-5/8" x 4-5/8". I never realized they stole this much image until yesterday when I started working on a negative with fairly tight cropping on the short dimension and I'd really like to get that image area back. Did Beseler ever make a carrier with a larger opening? I know there was a 4x5 pack film holder but I don't know its dimensions.

Yes, I could have either of the holders I've got machined, the glass one where the (removable) glass does the holding, but it sure would be nice to simply buy something.