Thanks for the responses. That Velo-Orange site looks like the best place for older-vintage parts. Their SS fenders also look cool! Went to a bike shop in my area that had been recommended for its stock of older parts. They had the levers, but wanted $69.95 for the set!
I'll buy them by mail order and spend the rest on tires, pedals, chain and a few other parts.
BTW: The bike I got appears to be a mid-1980's Schwinn LeTour; the frame's been repainted and doesn't have any decals, but Schwinn emblem is still on the headtube. Took apart the BB and headset; both appear to be in good shape, just need a good cleaning and re-greasing. If I don't get the frame/fork repainted it should cost around $125 to get it back in shape. Deraillers won't work either, but might just put a SS freewheel and tensioner on it to solve that problem (got a few of those in the garage). It'll make a nice errand bike!