Just want to inform about my experience. I found a source for Frantz as I wanted to replace the rubber "o-ring" and saw they had filters. I thought "This is better than the John Wayne toilet paper those guys on Stovebolt suggested." So I ordered 4 of their "cellulose" filters you can see here: https://www.frantzfilters.com/product-tag/parts/?orderby=popularity

Well I got my order yesterday and I'm here to tell you what I bought was FOUR ROLLS OF JOHN WAYNE TOILET PAPER!!!!!! At least the hole in the center is the correct size for the center of my oil filter and the o-ring is a perfect fit

1951 GMC with positive ground. Engine is a ‘54 Chevy passenger car (Serial Number 0024472F54Z) with a ‘56 head (casting code on top of head 3836848 GM 4), Casting Code (on passenger side on side of head B56 848 850)