How do I find out which Speed sensor I need?

1999 FORD CONTOUR
120,000 MILES
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ARIEZ28
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My car runs real rough.. almost as if its the transmission.. wont shift into gear right away, I have to play with gears..engine light comes on, runs real rough.. speedometer does not work mileage does not change. I purchased car from Auto Auction, so I have no history on it. Took it for Emissions test and my car failed Emissions test for code P0500 Vehicle Speed Sensor A and P1131 O2 Sensor. O2 sensor seems like wont be a problem, but how do I find out which Speed Sensor is needed..machine at mechanic shop did not provide info,machanic advsd he will need to get under vehicle to check for this additional charge.. I just want to buy the part and pay someone to put it on.. Please help!
Nov 2, 2011 at 9:54 PM
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RASMATAZ
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Could be the VSS and wiring problem-Start here
Nov 2, 2011 at 10:40 PM