Nissan doesn't sell many repair pigtails, unless they were part of a recall. The repair connectors come included in a $3000 Kent-Moore repair kit, which has each part of the connector separately (plug, terminal pins, weather seals, etc.) and they typically aren't meant for general sale to the public, but you might be able to check with a dealer's part department and see if they can help you out (but you'll need to bring them the connector or at least the sensor). If there is one place that "may" have a repair pigtail, it would be Wiring Specialties. They make conversion harnesses for people who do Nissan engine swaps and they have pictures of various connectors at their site. Otherwise, salvage yard would be the way to go.
Wiring Specialties - You Install The Engine, We Wire It Up