Fronts are not that difficult to find, and they usually sell for $15-20. Forget the rear. It's an incredibly spindly thing made (I swear) from old paper clips. I've heard complaints from original owners of the rear derailleur failing on the first ride home from the bike shop. Replace with a SunTour V - that seems to have been the 'standard' fix; to the point that I wonder if Lambert wasn't issuing them to dealers as a replacement. If you do find an undamaged rear, put it in a glass case as a collector's item. Everybody talks about the 'death fork' nobody ever discusses the rear derailleur which was a much worse piece of kit.