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Hey,
I think this has been covered before, but can someone confirm the NA bolt thread size and pitch that fixes the seat rails to the floor. I am trying to fit the fire extinguisher bracket to the floor. I have Bride seat rails (which are a little bit thicker), combined with the thickness of the aluminium extinguisher plate, and as a result the bolts aren't long enough to go a safe length into the captive but.

I think they are M10 1.25mm based on various threads. Not sure though.

Thanks.

Yep, M10, 1.25mm pitch. I bought some 25mm long bolts which worked fine.

What grade bolt did you use?

Using CAMS as an example, Schedule I 2(c) says a min grade 8.8

That was what was stamped on the top of the bolt. Always a good sign.