Avon SR4 bolt size for console fixings and transom supports

[chris.moody]

I want to fit some eye ring nuts onto the deck to strap down a fuel tank. Does anyone know the bolt sizes (diameter) for the rear fixing bolts for the console seat, and the bolts fixing the transom struts to the deck so I can order the correct sized nuts?

I would measure them but the rib is a 2.5hour drive away.

[Mollers]

The glassed in threads in our deluxe deck are M10. I'd guess that your's are the same.