it's important to know, 1 won't work with the other... ask your friend to read "Recessed..." from here...
http://www.sheldonbrown.com/gloss_ra-e.html
and go from there.
basically, if holes front and rear of brake bridge are the same size, it's nutted fitting, if one hole is significantly bigger than the other, it's recessed...
@TM started
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it's important to know, 1 won't work with the other... ask your friend to read "Recessed..." from here...
http://www.sheldonbrown.com/gloss_ra-e.html
and go from there.
basically, if holes front and rear of brake bridge are the same size, it's nutted fitting, if one hole is significantly bigger than the other, it's recessed...