Ride, Wrench, Swap, Race
Join Date: Jan 2010
Location: Northern California
Posts: 9,181
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
Mentioned: 132 Post(s)
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Quoted: 1562 Post(s)
For starters, I would measure the reach down from the bolt center to the rim side center, before choosing calipers.
Then, as 3alarmer said, determine if the mounting holes use recessed nuts or hex nuts.
People on this forum have parts stashes so look in the classified section or on Ebay for correct vintage calipers. Tretubi bikes usually had Gipiemme or other 2nd-tier Italian calipers, but Campag calipers would always look proper.
Newer and better calipers might be best for a larger rider. I would use stock brakes but I usually relax the return springs a bit, which improves braking power.