Ok...for those of you who own 1979-1986 Mustangs like mine....I found a RARE find in the boneyard today...I found a 1986 GT cargo cover for the rear hatch. Now..my question is...HOW does this thing install?? My car has the mounts for it...but I cant figure out how it mounts...it looks complete, with 2 round "keys" dangling on each end by nylon cords...what do these do??  Please help...am I missing hardware??

Mr86GT