Oh FFS
Items 10 and 13
REAR SHIM for 2011 Nissan 370Z|38154-0C000
SHIM for 2011 Nissan 370Z|38453-N3100
REAR AXLE for 2011 Nissan 370Z
You can't pre buy the shims anyway because you don't know what size you will need till you open up the pumpkin.
The thing you can't buy parts for is the VLSD unit itself (22), a sealed self contained unit, you can buy parts of the whole diff that's how people mess with the final gearing.