Need bolt size for seat belt mounting point to B-Pillar

[Blue Batmobile]

Can anyone tell me the bolt size I need to mount the seat belt to the upper part of the B-Pillar?

B@t

 

[greenberet]

According to the Service Manual (see Body / Seat Belts), it's a 7/16-20 UNF bolt.

 

[Blue Batmobile]

Thank You!

B@t