FYI: Campagnolo N./S. Rec Calipers and post 2000 Campy pads don't work.
 

Follow up FYI on my squeaking brake issue on my Gazelle. I'm going to replace the KoolStop Salmon pads with either the S/N. Record Kool Stop black pads, or go with a more modern pad / holder pair. This evening I tried one of the pads from my 06 Campagnolo Centaur brake set on the Serotta. No Dice. Seems in 2000 Campagnolo moved to a slightly larger bolt setup that is too wide for the slots in the Super Record calipers.

The good news is (although some might call it blasphemy) the current Dura-Ace style pad holders will work. I had a pair on the 'Cudas Tektro brake set and they worked just fine. I'm hoping the original pad holders and black kool stops will work, but I'll likely also order a set of tektro dura-ace style pads/holders just in case, or at least till the braking surfaces wear in a little bit.

cuda "machined rim surfaces are good" 2k. ;)

the kool-stop dura ace holders and pad sets are really nice and have concave washers (unlike the older official dura-ace holders) to adjust toe-in without bending the brake arms..

also, they come with two sets of pads made with different compounds

Yeah, but at $25 a pair they're a bit steep, though I suppose if I don't use them I'll be able to put them on another bike sooner or later.