What causes the GT rear bumper cover to sag?

[88 Fox GT]

And how would I go about trying to fix it?

View attachment 462801

 

[ram360]

you should have the two U shaped supports in the center of it

 

[Strype]

Or you could "redneck it" like I did and just throw a couple of wood screws through it

 

[glowstang93]

On my 92 LX I used a piece of wood and some rags. Yea, its redneck, but there shouldn't be anyone looking under my pony's skirt anyway