provided on either end of the heat exchanger c to allow the impact force imparted on the front of the vehicle to be transferred to the heat exchanger c in normal use prior to any impact a mounting pin p of each corner of the heat exchanger c will reside in corresponding first recesses 12 of each bracket 10 the small width of the retaining channel 18 relative to the mounting pin diameter p prevents the pin p from slipping out of the recess 12 in the event of a frontal impact at one side of the vehicle a portion of the vehicle body will deform in the first instance which will reduce any clearance between the crfm c and the front of the vehicle in a first phase if the impact force is relatively small no movement of the crfm c will occur however if the impact force is larger it will continue to exert a rearward force represented by force arrow f on the crfm c in a second phase via spacer members 22 such rearward force causes mounting pin p on both the upper and lower portions of that side of the crfm c to move from the front recess 12 into the retaining channel 18 of the displacement portion 16 the resilient walls 19 of the displacement portion 16 flex outward under this force in order to accept the larger dimension of the pin p the pin p will continue travelling from.