Abstract: A box-shaped component is mounted within a vehicle body by a bracket attached to the vehicle and having slide surfaces which slidably receive the component. A retaining element is provided on the component. A retainer member, preferably a lever, is movably mounted on the bracket for movement between retaining and releasing positions with respect to the retaining element of the component. The retainer member has a first engaging element capturing the retaining element of the component at a first position of partial insertion of the component into the bracket. The retainer member also has a second engaging element for capturing the retaining element of the component at a second position of full insertion of the component into the bracket. The retainer member is preferably a lever.