These are all the gaskets necessary to install OEM style stock frame turbos on an N55 Engine. Recommended purchase with install of all new N55 Turbochargers.
These can also be purchased at local parts counter on an as needed basis by the customer and/or installer. Check with the installers to see if these materials are provided (on their behalf) as part of their installation quote. If they are not installer provided (typically they are not) then providing the installation team these materials will allow them for a much simpler install process.