I decided to take it upon myself, especially after picking up a g35 6spd (non hr /concentric) transmission, to see if the newer v6 xterra 2wd's (lookup year 2008) tailshaft and shifter housing would swap over to the 350z/g35 transmission. Here is proof that it will. Notice in the schematics how the sandwich plates on both transmissions are the same number 32138. I'm going to be calling Nissan later today to see how much the tailhousing assembly is off the xterra...and posting my findings. This may be a better solution for locating the shifter in the s chassis with the tranny swap...
350z
Xterra 2wd