Peugeot are usually iso or french. Check Sheldons website for details of both there is a b.b data base with all the shell widths but from memory French have the same shell width as iso so you'll have to remove the b.b to find out. When you remove the drive side you will find out from wheather it has left hand or right hand threads.
If it is iso buy a cheap shimano cartridge b.b (providing your crank is jis taper). If you need to move the chain line 2 mm inboard get a b.b 4mm shorter (due to symmetries).
If it is french, buy a non cartridge b.b of what ever length you want and just use the spinddle.
Or spend £$ on a phill wood french b.b