I think you will need these: http://freshtripe.co.uk/velo-orange-canti-brake-rack-mounting-bolts/
thanks! (Edit: I took off one of the bolts, and indeed the velo orange ones look perfect, assuming the size is standard (5mm?), plus the brake did not spring apart)
@hoefla started
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I think you will need these: http://freshtripe.co.uk/velo-orange-canti-brake-rack-mounting-bolts/