Do you mean the John Deere LT166 Lawn Tractor with 48" Convertible Deck mower. If so, the replacement belt is GX10063, according to the maintenance sheet: https://jdparts.deere.com/partsmkt/document/english/featbene/fb_MaintSheet_LT166_48CdeckLawnTractor.pdf . One vendor has the belt here: http://www.greenpartstore.com/John-Deere-Drive-Belt-GX10063.html .
I hope this helps. If you have a different mower deck, please add a comment with more information about your specific mower. I may be able to find additional JD parts for the machine. You can also look up parts here: http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view.servlets.HomePageServlet_Alt .
Cindy Wells
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