GKTECH Z34 370Z RZ34 Extended dual stud diff cover install kit Accessories only (Solid Secondary Bolt In Only) (Order in)*NOTE* Currently is an order in product from GKTECH In Australia. Takes roughly 3 4 weeks Listing is for: 1x Solid Secondary Diff Bushing Bolt In Install Here it is! The one stop shop for installing a dual stud diff cover in your Z34 370Z and RZ34! The Z34 OEM diff cover uses a single stud at the rear which is prone to breakage in high grip hp setups. We make a diff brace which does help but a dual stud cover is the ideal solution. The GKTECH Z34 370z