referring to fig1 - 3 , a headlamp module 10 includes a housing component 11 with a mounting section 12 that connects with a compensation bracket 13 . bracket 13 has a first end 16 for joining with mounting section 12 and a second end 17 that connects to a rigid support structure of the vehicle such as a grille opening reinforcement ( gor ) 14 or another cross car frame member . the vehicle has a front - to - rear direction 15 coinciding with the vehicle &# 39 ; s direction of travel . this is also the main direction in which collision with an impactor would occur . as shown in fig2 , first end 16 of bracket 13 has first and second bores 18 and 19 which extend perpendicularly to vehicle direction 15 . mounting section 12 on headlamp housing 11 includes first and second parallel , upstanding ribs 20 and 21 to define a channel 28 with an axis aligned substantially parallel with vehicle direction 15 . channel 28 has first and second contact surfaces 30 and 31 which slidably receive first end 16 of bracket 13 . ribs 20 and 21 prevent bracket 13 from moving in the cross - car direction . first rib 20 has a first opening 22 which may be formed as a u - shaped slot opened at the top to provide a height adjustment of the mounting position . second rib 21 has a second opening 23 disposed coaxially with first opening 22 , which may also be formed as a u - shaped slot . first rib 20 has a third opening 24 coaxially disposed with a fourth opening 25 on second rib 21 , both of which may also be u - shaped slots . a first u - nut 26 is slidably clipped onto second rib 21 and has a first receptacle 32 disposed coaxially with openings 22 and 23 . u - nut 26 may provide a portion of second contact surface 31 . similarly , a u - nut 27 is slidably clipped onto second rib 21 over fourth opening 25 to place its second receptacle 33 coaxially with openings 24 and 25 . preferably , receptacles 32 and 33 may be threaded in order to secure first and second fastening bolts 34 and 35 . more specifically , a shaft 36 of first fastening bolt 34 passes through first opening 22 , bore 18 , opening 23 , and receptacle 32 so that a bolt head 37 bears against first rib 20 and a threaded end 38 is gripped by receptacle 32 . shaft 36 of fastening bolt 34 has a first diameter in the regions passing through openings 22 and 23 and bore 18 . likewise , fastening bolt 35 has a shaft 40 having a second diameter ( which may be equal to the first diameter ) passing through openings 24 and 25 with a threaded end 42 received by receptacle 33 and a head 41 bearing against first rib 20 . fastening bolts 34 and 35 may be tightened to provide a predetermined compression of contact surfaces 30 and 31 against first end 16 of bracket 13 , wherein the compression is configured to fixedly retain the headlamp module at a desired position with respect to the rigid support structure . at least either 1 ) the open diameters of openings 22 and 23 or 2 ) the open diameter of bore 18 is greater than the first diameter of shaft 36 so that the relative position between bracket 13 and mounting section 12 is adjustable . during assembly , first end 16 and bores 18 and 19 are more easily aligned with bolts 34 and 35 extending through the rib openings and into u - nuts 26 and 27 . the open diameters of openings 24 and 25 and / or bore 19 are likewise greater than the diameter of shaft 40 . although bores 18 and 19 are shown with circular cross - sections , other shapes are possible . moreover , clearances for movement in different directions can be accommodated by providing different directions for any non - circular diameter increases of either the rib openings or the bracket bores . fig4 - 6 show compensation bracket 13 in greater detail . in the side view of fig5 , dashed lines inside bore 18 illustrate an alternative cross - sectional shape ( e . g ., oval ) in which the direction of the increased diameter of bore 18 would provide a front - to - back position adjustment . bore 19 has a circular cross - section with a diameter d 1 in which bracket 13 provides both front - to - back and up - and - down adjustment . as shown in fig6 , second end 17 includes a mechanical connector 45 of any suitable type for joining bracket 13 to the rigid structure . fig7 shows the initial installation of bracket 13 into channel 28 so that bores 18 and 19 are aligned within openings 24 and 25 . u - nuts 26 and 27 may be moveable on rib 21 in order to align the receptacles with bores 18 and 19 . alternatively , rib 21 may include respective recesses for receiving u - nuts 26 and 27 at a fixed position , or u - nuts 26 and 27 may otherwise be made non - slidable on rib 21 . nevertheless , the larger diameter of bores 18 and 19 ensure that the receptacles are accessible to the fasteners . even if u - nuts 26 and 27 are not slidable on rib 21 , bracket 13 is slidable over the u - nuts whether it contacts them or not . fig8 is a cross section showing the vertical clearance between shaft 36 and bore 18 . prior to tightening of fastener 34 , up and down movement is allowed both by the clearance within bore 18 and the upward openings of u - shaped slots 22 and 23 . fig9 is a horizontal cross - section showing the horizontal clearance between shaft 34 and bore 18 . thus , movement in the front - two - back direction is permitted by the horizontal clearance of bore 18 . during assembly , the fastening bolts are tightened according a torque that results in a fixed retention and support of the headlamp module . due to the planar nature of the contact surfaces , sliding is prevented only by the compression force . according to the present invention , the predetermined compression is adapted to allow sliding between the compensation bracket and the sliding contact surfaces of channel 28 in response to an external force greater than a predetermined force acting in a plane parallel to the contact surfaces . in other words , a collision force which is acting downward and / or rearward of the vehicle causes a relative movement between the headlamp housing and the fixed vehicle structure . a portion of the energy of impact is absorbed by the sliding response , thereby lowering the acceleration to the impacting body . moreover , the likelihood of damage to the headlamp module is reduced .