Hello:
first of all do the pads have the same hardware as do v-brake pads? if not you may have to use v-brakes that comes with beveled washers.
when using these pads on these center pull brakes be sure that the thickest washer is on the inside of each brake arm.
when adjusting them to the rim while have the cables intack and the spacers and nut on the pads lose but connected squezze the lever while holding the pad to the rim like you want it the squezze the tight while tighting the nut on each pad.
when you are finished if the brakes squeak the toe the pads in toward the front with a adjustable wrench.
Thank you
Earl