A slip plane bracket for a front end sub-assembly of a vehicle and method of assembling the front end of the vehicle is disclosed. The slip plane bracket attaches a headlamp module to a bolster at a front end of a vehicle to facilitate adjustment of the headlamp module location relative to the front fascia, headlamps and grille. Headlamp modules are assembled to a bolster through a slip plane bracket interface that is adjustable in X (longitudinal) and Y (lateral) directions to achieve improved fit relative to adjacent modules. According to the method, a pair of headlamp modules is attached to the bolster with an adjustable fastener to set the height of the modules. Slip plane brackets are assembled to tabs provided on the headlamp modules and the location of the slip plane brackets is adjusted in a longitudinal plane and a lateral plane.