Eric and All,
Having been fond of Mavic (almost as much as Suntour!!) from early on, I'll offer my ca '86 suggestions for your Peugeot: Hubs: 500RD; Rims: Choose/GEL-280/GL-330/GP-4; Front/Rear Derailleurs: 851; Shifters: 820 (The Retrofrictions); Headset: 310; Bottom Bracket: 600RD; Crankset: 640 (I don't think the 631 appeared until '88??); Pedals: 600; Brakes: 420 (Modolo Professionals or Speedys??) Seatpost: I don't think a Mavic seatpost appeared until the late 80's (even perhaps early '90's?).
Sounds as if you have already been advised to look elsewhere for Bars and Stems!!!
Cheers,
Chuck Brooks Malta, NY (after a beautiful week - a rainy weekend)