Abstract: On the rear side of the front panel (1) of an electronic equipment, at each lateral end which overlaps an edge of an aperture (3) into which the electronic equipment is being inserted, bushings (5) having rearwardly extending catch members (6) are fastened to the rear of the front panel by screws (12). The bushings are of resilient synthetic plastic. The catch members are disposed around a continuation of the central bore of the bushing. Stepped bores (14) are provided in the wall portion overlapped by the front panel. When the bushings are inserted into these stepped bores the catch members are first deflected inwards and then, as they reach their final position, spring outwards and catch against the step (16) of the bore (14). Mating projections (9) and openings (10) lock each bushing against rotation as it is screwed on to the front panel (1).