Keep in mind that the "Graflex 23" mounting board has different dimensions than the "Graphic 23" for 4x5" cameras.
The "Graphic 23" will fit on cameras with the Graflok back/
The "Graflex 23" will only fit on the Graflex back cameras (Auto Graflex RB, some Combat Graphics and Top-Handle Graphics)
The light baffle on the right hand side of the back is also reversed between the two types. Graflex holder has a groove, Graphic holder has a ridge.
Keep in mind that the "Graflex 23" mounting board has different dimensions than the "Graphic 23" for 4x5" cameras.
The "Graphic 23" will fit on cameras with the Graflok back/
The "Graflex 23" will only fit on the Graflex back cameras (Auto Graflex RB, some Combat Graphics and Top-Handle Graphics)
The light baffle on the right hand side of the back is also reversed between the two types. Graflex holder has a groove, Graphic holder has a ridge.
Not sure if the OP found one. The Graphic 22 and Graphic 23 roll film adapters can be found pretty easily.
Here in the Netherlands, I use two "Graphic 23" roll film holders for my 2x3" and 4x5" Speed Graphics and a "Graflex 22" roll film holders for my Kodak Auto Graflex camera.