Yes, the 350Z uses different diff flanges than the 370Z. The 350Z uses bolts, washers and nuts to fasten the diff stubs to the axles, where the 370Z just uses bolts that thread into the flange assy OR axle joint assy with RED loctite. Interesting that the bolt head flips from the diff side to the tire side starting on the 2011s. The 350Z (Z33) always keeps the bolt head to the tire side and nuts on the diff side.
If you're changing out final drives, I created a
post back on 5 JUN 2010 listing different final drive ring and pinions from the Frontier that bolt into the 350Z/370Z R200V.
350Z
Open and VLSD differential axle joint assy inner both sides: 39711-AR402
Open differential flange assy both sides: 38220-AR000
VLSD differenital flange assy left side: 38220-AR011*
VLSD differenital flange assy right side: 38220-AR010
flange assy bolt x12: 39606-22P0A
flange assy washer x12: 08915-2401A
flange assy nut x12: 39607-03P0A
370Z
'09-'10 Open and VLSD differential axle joint assy inner both sides (thread): 39711-EG00A
'11-'13 Open and VLSD differential axle joint assy inner both sides (no thread?): 39711-1BP0A
'09-'10 Open differential flange assy both sides (no thread):38220-EG000
'11-'13 Open differential flange assy both sides (thread?): 38220-1NC0A
'09-'13 VLSD differenital flange assy left side (no thread): 38220-JK01B* <--FAST superceeds this -'10 part number to the '11+
'09-'13 VLSD differenital flange assy right side (no thread): 38220-JK01A <--FAST superceeds this -'10 part number to the '11+
flange assy bolt x12: 39606-17V0B
The 370Z axle flange assy bolt dimensions are: M10x1.25x~26, 14mm wrench, non threaded part of shank = ~8mm.
ARP hardware to replace 39606-17V0B:
M10x1.25x30 = ARP 663-1003 x3 hex bolts
M10x1.25 (nut height ~10mm) = ARP 300-8364 & 300-8354 12pt nuts
*=The O.S. GIKEN LSD and possibly other mechanical LSDs use two of these "stubs" due to the shorter length w/the C-clip.