Seatbelt bolts

Hi,

Doing some rust repair and my seat belt bolt, on the seat belt retractor.

I thought it was an M10 but it doesn't look right and it's pretty corroded. Anyone know what size it is?

Oh it's an 83 if that makes a difference.

Cheers

Alex

Searching online, 7/16-20 seems to be standard even for European made cars.

Has anyone checked this?

Tomorrow I will try and source one and see if it fits...Will report back

I went to my local garage that are doing my MOT and we measured the bolt, it is 11mm diameter.

We then measured a 7/16h bolt which was also 11mm. I tried the 7/16 and it fits.

Hope this helps someone.