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I'm assuming you mean the driver's side power window motor?
If so, according to Wholesale GM Parts Online there are two available for a '96 C2500. One with a straight connector (19151982) and one with a 90 degree connector (19153451). Number 61 on this diagram.
You might try checking car-part.com and row52.com for seats. These are services that index salvage yard inventories across the USA. Car-Part is full service yards, Row52 is U-Pull-It type places.