a cover trim member for engagement with {TAIL ~ the housing} for enclosing the cavity when {HEAD ~ the cover trim member} is engaged with the perimeter of the concave surface to the housing, 
a cover trim member for engagement with { TAIL ~ the housing } for enclosing the cavity when { HEAD ~ the cover trim member } is engaged with the perimeter of the concave surface to the housing ,
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH