92 Rodeo needs wiper assembly

I have a 92 Isuzu Rodeo in need of a wiper linkage part ... specifically the socket that marries the wiper motor arm [ball] with the wiper bar assembly. The socket is a plastic piece, and the ribs
that hold it into place on the end of the wiper bar assembly have broken.
Can anyone help? I realize that the socket can not be removed, so I anticipate that I must find a matching assembly if I can not find the actual part.
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