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veloham
Wow, those Dunlop tubs!
Memory is a bit hazy, but there are two types of Fiamme rim. There's a lower profile type which has a more rounded top and it was intended for track-only bikes i.e. without brakes. If you look in the old catalogues you can see the difference. I don't think you can use brakes with those because the rim isn't deep enough to accommodate a brake block on the side of it. I have a feeling your new ones might be those.
Re. buying tubs, I had a similar situation. I came to the conclusion that the common size back then was 1", not as skinny as 21/22/23mm like they are these days. I went for Challenge Vulcano in 25mm and there's also the Challenge Strada Bianca tan wall in 30mm which has the same ribbed tread pattern as those Dunlops (edit: though I just checked and it doesn't seem to have the ribs any more). That was a few years ago I bought those, mind, and the trend with tyres has gone a bit wider so you might find more 25-28mm tubs these days.
Check out these:
https://www.flickr.com/photos/23666168@N04/16565483866/
http://www.users.globalnet.co.uk/~pattle/ddgcs/tyres2.htm