Hi, I'm not an associated man personally so don't know the exact dimensions of the pin in question but I use
www.accuscrews.co.uk for all my hardware. They do imperial and metric stuff in a choice of materials. You have to buy a certain number per item (normally 20, 50 or 100 of each) but the unit price is so cheap that it normally works out massively in your favour (7 to 10p each for small dowel pins etc..).
Take a look this might be the way to go.