Bob,
Just wondering, what makes you think those are Mafac? Is it just because the ebay seller says so? No insult to anyone intended, but I wouldn't be surprised to find out otherwise - they don't look like any Mafac part I have seen.
Mark BulgierSeattle WA USA > > http://i2.ebayimg.com/02/i/08/5b/ca/b9_1.JPG