Rockauto.com is a good place if you are looking for aftermarket replacements comparable to your stock units, but many feel the stock lift shocks are a bit on the week side. There is an entire thread on this, which I'll line below. The stock units for the lift gate are 175 lb. force units. At McMaster-Carr, you can get 200 or 225 lb. force lifts which seem to be a lot better suited for the Pathfinder's heavy lift gate. On my 2006, I went with 200 lb. units and have been very happy with them. The part # is
9416K148. You can order them here:
http://www.mcmaster.com/#
You can find the 14-page thread here:
http://www.thenissanpath.com/viewtopic. ... sc&start=0