Charles,
One thing you might consider is to buy some 118 rings and "ream them out" with a file or a dremel (www.sjscycles.com). This at least will get you going with NOS items (up those hills ??) until vintage zeus rings show up. In the long run there aren't making either type of ring any more and so you might have to resort to highpath engineering:
http://www.highpath.co.uk/
I wonder if they will omit all markings ?? Current stronglight 122 bcd rings omit all markings, so that seems almost plausible for the last run of zeus rings ....
- Don Gillies
San Diego, CA