This is the threaded insert used on the MMU2 Selector cover and Filament Sensor cover.
GATES LL-2GT RF 6mm Width 2mm Pitch for MK3/MK2.5 Belt for X AXIS
Regular price $5.69
GATES LL-2GT RF 6mm Width 2mm Pitch for MK3/MK2.5 Belt for Y AXIS
Bear X Axis Dowel Pin for 3mm bore stock idler
Regular price $1.39
Bear X Axis Dowel Pin for E3D Gates 5mm bore idler
Regular price $1.69