Bolt ident help

Evening all,

Trying to buy new bolts for my seat belt mounts (Rear seat belts), but they are not all the standard 7/16 UNF as their diameters vary. Any help with the markings on the bolt heads could also be a great help to source the right thing as they are all different too! I am wondering if some may be metric as cannot find appropriate UNF sizing.

Boot floor mountings (Middle seatbelt)
Hex Head flange bolt
Head marking: TK M1
Dia: 0.41"
Length: 1.37"

Wheel Arch mountingsHex Head flange bolt
Head marking: L S
Dia: 0.43"
Length: 1.07"

Seatbelt reel (side wall)
Hex head
Head marking: A2-70 THE
Dia: 0.46"
Length: 1.18"

Top mountingHex head flange boltHead marking: L S
Dia: 0.43"
Length: 1.63"
(I am assuming 7/16 UNF for this one)

Some parts sites like LR series or LR direct often put the size of the bolt on the page of the appropriate part number. This might help.

I use the "If it fits in the hole it does" method.

A2-70 is some sort of stainless steel. That's the only one I recognise.

Hi folks,

I decided to buy myself a metric and also imperial tap and die set. A quick play about and i managed to identify all the bolts. They were all 7/16 UNF with the exception of the A2-70 which was an M12 (a modification i assume!).

I was surprised they were all the same as even after taking off the rust and crap, they still measured different. I assume a lot is due to material loss though.