this is what you have to find out first.. is the gearbox the oem lsd gearbox or is it a standard gearbox with an aftermarked lsd fitted inside it... the oem lsd gearbox has the lsd on the outside of the box and requires a completely different back mount... the standard box with aftermarket lsd fitted inside it doesnt require a different back mount.. its the same as the standard box with no aftermaket lsd fitted inside.. where the drivers side drive shaft goes into the box can you see whats circled in picture below??