A rail mounting arrangement for fixing a rail relative to storage racks comprises a rigid plate upon which a support member of the storage racks is adapted to be mounted upon a face thereof and including studs spaced a predetermined distance from the support member for attaching the rail in predetermined spaced relationship to the support member. Anchoring means is also provided for anchoring the plate to the floor of the storage space and a shim arrangement is provided for positioning and maintaining the height of the plate with respect to the floor.