Success!!  I found a sink basket strainer assembly through the catalogue of
The Trailer Shop in Danvers, MA (978-750-6799).  Manufactured by ProPlus and
fits like a charm!!!  Screws right into the P-Trap and even has a rubber
gasket that can be used to replace the one under the sink.  They also carry
the basket only, which seats perfectly in the OEM drain.

Joe