I checked the part numbers on courtesyparts and the knuckle spindle for the 4th and 5th gen are the same. Can someone verify this?

 

Call Courtesy Parts? Call Nissan Parts?

FWIW: the Courtesy Parts website part numbers never seem to match up with the actual Nissan part numbers. I always call Courtesy when ordering parts from them. Have you're VIN number handy, that's the best way to make sure you're getting the right parts.