Low car diet
Join Date: Aug 2007
Location: Corvallis, OR, USA
Bikes: 2006 Windsor Dover w/105, 2007 GT Avalanche w/XT, 1995 Trek 820 setup for touring, 201? Yeah single-speed folder, 199? Huffy tandem.
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If you're unfamiliar with French bikes--and their unique dimensions--I recommend looking at this page before attempting to replace anything (specifically the "Some dimensional differences" chart near the top): http://sheldonbrown.com/velos.html
The stem/handlebar clamp diameter may be 25mm (instead of today's standards of 25.4, 26, or 31.8mm). The quill diameter/headset inner diameter may be 22mm (rather than standard 22.2mm for 1" headsets).
Assuming the Peugeot uses the sizes outlined in the chart above: A standard 1" stem will fit new bars but its quill will be too wide for the French headset. A French stem will fit the French headset, but the clamp will be too small for modern bars.
To use modern handlebars/stem, see "Handlebars/stems" just below the chart.
Sorry if the above was more info then needed (it was full of assumptions). In any case, it's a good idea to remove the stem as barba outlined and grease the quill.