Spare braze-on bolts?

Jamey

One of the bolts fell out of my rack on the way home last night (bit of a calamity week all round for me) and I ended up fixing it back in place using a bolt from one of the braze-ons underneath the down tube but this means there's a hole in a prime muck-gathering location under the bike so I need to get some replacement bolts ASAP. Also the bolt I used doesn't match the one that was originally in the rack so they're different on either side which is pedantic but little things like that annoy me.

So I need to buy spare bolts, however I didn't realise there were different sizes:
http://www.wiggle.co.uk/p/Cycle/7/LifeL ... 360033795/

Are those the right thread? And which size do I need - 10, 12 or 16mm?

Jamey

Anyone?

nicklouse

measure the one you used?

and which braze on is it.

nicklouse

http://www.parktool.com/repair/readhowto.asp?id=89
scroll down.

could be one of 2 sizes.

5mm x 0.8mm Many uses on bicycles, including derailleur wire pinch bolts/nuts, disc rotor mounting bolts, fender and racks mounts, water bottle cage bolts, and others

6mm x 1mm Many uses on bicycles, including brake caliper mounting bolts, brake pad bolts/nuts, some fender racks, some brake adjusting barrels