Joined: Apr 2007
Posts: 12,564
Likes: 2,739
From: Thunder Bay, Ontario, Canada - burrrrr!
Bikes: 1958 Rabeneick 120D, 1968 Legnano Gran Premio, 196? Torpado Professional, 2000 Marinoni Piuma
You will have no problem at all. I, personally, do prefer 1 1/8" for looks and performance but they are best only if mounted on appropriate rims, such as the ones one of the OP's bikes.
As for availability, it is rare that a set cannot be found on Ebay. In fact, a quick search I conducted just now produced 100+ listings. Go for the Panaracers Pasela - good 27" tire, in my opinion.
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"98% of the bikes I buy are projects".