seatbelt bolts

[TJC46]

Hi guys does anyone know the thread size for the seat belt mounts? I have to fab 4 off mounting points, 2 that sit on top of the outrigger[seems to be just a folded piece of flatbar with a nut welded in place] and the other 2 which i will turn and thread on a lathe at work. All four bolts managed to snap as i tried to remove/undo them,thanks Tom.

[K4TRV]

7/16 UNF.