Looking for some option for making the seat belt longer so it will fit right. Do not want to go to racing harness set-up. Any suggestions.

 

seat belt bolts are an SAE standard size, so every car in the world uses the same thread

 

International seat belt bolt standard is 7/16 NF (7/16-20).

I don't know how this will help, though.

 

That answers why a metric wrench wasn't quite right. I kinda figured they might have standardized it.

 

Thanks

 

since the SAE standard is only the thread, the later Mazda's have a metric head on the bolt.

Mazda usually only sells the bolt with the seatbelt or buckle, so not a lot of part numbers, although they do vary in length

 

They really don't want you using any random bolt for the seatbelt!

7/16-NF is a weird size even in SAE even though it is a "standard" size. Sort of like how a lot of engines' head bolts are 9mm or 11mm thread.

 

When you relocate a battery to one of the storage bins, it helps to use a seatbelt bolt to ground the battery to a rear seatbelt "bung". Clean the paint off the metal and it works great. Thoughts?