UPDATE:
The VSS for a 1993 and later (no pigtail) will fit a 1991 (with pigtail) just fine. The wiring harness will reach without altering it and the plug is a perfect match. The VSS I bought new on eBay for $4.19, shipped to my front door. It looked like a quality part but I haven't had a chance to drive test it yet, that will be tomorrow (I'll let you know). What a savings over the dealer's price of around $200.
Can anyone else confirm this? Same dilemma