Pillion footrest bolts

Hi, does anyone know the spec for the bolts that hold the pillion footrests onto the frame. (ST50)? There is one female thread that is part of the rear swing arm. An M10 goes in a coupl of mm but then does not want to know.
Many thanks, Ian

Listed by Honda as being 'bolt flange 10x20'. If a normal M10 isn't going in then it may be an unusual pitch thread, rather than risk damaging it probably better to get a couple of new ones.
Honda part number 957011002007 at 68P (+VAT) each.

Hi guys
I have found that a lot of standard metric bolts dont fit and have found Honda use metric fine threads
Regards Tufty

TUFTYNUTKIN wrote:Honda often use metric fine threads

Correct!