Replace sensor sockets?  Perhaps they are suggesting that you buy the special socket that allows you to remove/install the O2 sensors without cutting the harness connector off. If that is the case, then 'yes', you should buy one of those. 
1999 Contour SE Sport MTX75 T-Red/Grey
Audio: Pioneer DEH-7400MP (MP3 CD), Pioneer TS-A6857 front & rear, PPI PCX-250, Infinity Perfect 10.1
Other: cup holders, cargo net, Blizzaks, Potenza RE950s
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