the lances 52 also pierce the cover flap a firm interconnection between the retainer and pan and cover flap is achieved which firmly maintains the cushion 12 upon the pan 14 as will be readily appreciated from fig9 and 10 the presence of the bulbous end 40 on the retainer produces an attractive and snag free transition between the retainer and the cover flap firmly holding the cover flap and cover under tension as initially produced by the fingers 56 of course it will be understood that the finger spaces 57 are in alignment with the lance holes 62 so that fingers 56 do not interfere with the penetration of the lances 52 through the cover flap the width dimension of the retainer portion 42 is sufficient to overlap the cushion flap end 68 so that the cover flap end 68 is not visible and upon complete assembly an attractive relationship between the pan 14 and retainer 16 is achieved as will be appreciated from the rear view of fig3 after initial assembly of the retainer 16 on the pan peripheral region 32 wherein the lances 52 have entered the pan holes 62 and have penetrated the cover flap the fingers 56 can be withdrawn so as not to interfere with the insertion of the screws 58 and the final tightening and positioning of the retainer 16 on the pan peripheral region from the above description it will be understood that the use of the retainer 16.