Due to end of production / unavailability of relatively cheap one-sided green-sensitive 14x17" sheet film (Agfa CPV-B, Kodak/Carestream Ektascan BR/A) I consider moving from 7x17" to 5x12" format. I would like to cut the Fomapan 100 24x30cm halfway. But I'm not sure about the exact size of 5x12" sheet film or inner dimension of 5x12" sheet film holders.
Fomapan 24x30cm has exactly 238mmx298mm, so one half is 119mmx298mm .
Could you please write me the size in millimeters 5x12" of sheet film like HP5, FP4 or film from other manufacturers?

Thank you.