JK rear seat belt bolt size?

SO I removed my rear seat belts for a tub liner and the bolt that attaches the seat belt to the bottom of the roll bar broke off and is impossible to get out! Does anyone know the actual bolt size i.e. (M12, 1.25. What size is this bolt? HELP! I got family coming into town last minute and gotta get this thing good to go

off size

not sure but I work for Toyota and all our belt bolts for the floor are 11 mm, we don't want people just using any old bolt to hold the belts down, make sure you get the right size bolt.