Abstract: An apparatus (10) helps protect an occupant (14) of a vehicle (12). The apparatus (10) includes an inflatable vehicle occupant protection device (22) inflatable between a steering wheel (30) of the vehicle (12) and the vehicle occupant (14). A housing (26) helps support the protection device (22) on the steering wheel (30). A cover (40) helps conceal the protection device (22) in a stored condition on the steering wheel (30). The housing (40) includes a retainer element (132) that extends from a side wall (124) of the housing. The retainer element (132) includes a base portion (232) and a head portion (234). The cover (40) includes a retainer aperture (230) through which the head portion (234) is extendable to help secure the cover to the housing (26). The head portion (234) has a dimension that is greater than a diameter of the retainer aperture (230).