and airbag therein as a sub assembly are then assembled into the mounting member 10 so that the fasteners 32 project through the apertures 34 in the mounting member base 12 with the flanges 50 54 of the cover 40 sandwiched between the base 28 of the retainer 26 and the base 12 of the mounting member 10 the mounting member 10 has its walls 20 22 so spaced that the walls 46 47 and 48 of the cover can be received within the mounting member 10 as the fasteners 32 of the retainer 26 are passed through the apertures 34 the ramp like projections 60 cause the walls 48 to be urged inwardly by the walls 22 of the mounting member 10 until the projections 60 align with and snap through the slots 24 in the walls 22 the inflators 16 are then placed in position with the fasteners 32 passing through the apertures 36 in the flanges 18 suitable nuts 61 can then be applied to the fasteners 32 to hold the assembled parts together the use of the snap fit projections 60 provides additional mounting security of the cover 40 without the need to provide further screw threaded fasteners moreover by sandwiching the bent over flanges 50 54 between the mounting member 10 and the retainer 26 the cover 40 is held in a very secure manner.