The Thule 5075 Luggage Box Adapter Kit is required for mounting older Thule boxes to vehicles with over-sized factory bars. The Thule 5075 Luggage Box Adapter Kit replaces the Quick Snap hardware with the adjustable Thule Quick Mount (QM3) hardware.
Click here to launch fit guide.
This kit was perfect to convert my Thule WeekendER box to fit the wider support bars on my 2010 Town & County. Identical to the factory hardware (maybe even better) just wider.