I'm doing a rebuild on my 2000 3.0 Ranger and I was trying to reconnect the ground strap that goes from the engine block to the firewall. I dropped the bolt that goes into the engine block and can't find it. Does anyone know the specs of this bolt? Thanks for any help.

 

Where did the bolt go ?

 

On my 2004 Mazda B3000 DS with 3.0l, its a 13mm bolt about 3/4" long into the driver side cylinder head.