Access cab rear seat head rest bolt length

I sold my rear seats and now I want to bolt the Tacoma twins molle panel where the head rests would normally go. I don’t have the bolts anymore, does anyone know the LENGTH of the 4 bolts holding the head rest? I believe they’re 12mm

 

They are 12mm. The threads are 3/4" long, including the lock washer and washer (which take up about 3/16"). The whole bolt is about 1" long. Did this with a tape measure, so not exact and not metric.

 

Feed a nail or something similar into the hole, mark where it is at the top.

 

Thanks I appreciate it, will save me some time in the Home Depot parking lot. Lock washer huh? I don’t remember mine having that but it’s been years so who knows

 

The lock washer is small and thin. It one of those bolts where the washer & lock won't fall off the bolt. If you are going to Home Despot you'll probably find something that works, but doesn't match.