If you don't mind some subtle upgrades, you can always pull a set of decent 20" aluminum wheels from a current kid's bike and the crank, if it's chromed. The chainring should be easy enough to find on eBay.
The same handlebar stem can be found on the upright-bar Schwinns of the time - the Breeze, Collegiate, Speedster, and a few others used it.
-Kurt
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