Two stage high retention fastener

A fastener System for use with an air bag includes a fastener having a rounded base having a flat portion, and first and second arms oriented transverse to the flat portion. A first set of engagement devices is connected proximate the rounded base. A second set of engagement devices is connected spatially separated from both the first set and the rounded base. A vehicle component has a dog-house. The rounded base is received and engaged in a dog-house cavity connecting the fastener and vehicle component. The vehicle component displaces upon air bag deployment from a first engagement position having the first engagement device set engaged with a vehicle body panel, to a second engagement position having the second engagement device set engaged with the vehicle body panel. A second fastener sliding part allows telescopic extension of the vehicle component. ( Fig. 1 )