For what its worth, I remember going to my high-end bike store in the early 80s for some Nuovo Record small parts. I was going through a catalog sheet from the distributor with the owner and was surprised to see you could still order the front derailler cable stop body. I wouldn't be surprised if you find them on any of the Nuovo Record type fronts, not just the early Records. Many frames came with a front cable stop on the downtube, that would be the correct derailler for them. BTW, I could use one or 2 for my Carltons, though I may use the oldschool solution of running housing under the bb until I find one at an affordable price!