These small plastic sleeves are used with the rubber radiator bracket grommets to allow for proper installation of the upper radiator brackets on one piece radiator shrouds. Often these are missing, so be sure to replace them if so as this can cause lots of minor issues with radiator play. Two required per car. We 3D print these in house here at Wild Child.
 
We also stock the original steel version (CAM4415), but they are expensive.
 
Sold individually.