There are 2 springs, one on each side of the bottom of the grill. Lying on the ground, you have to go under the front bumper of the car and look up at the grill and check it out to see them. Yours MAY just be unattached and dangling loose, but most likely broke/rusted/or fell off.
You should be able to get them at a junkyard OR you can try putting a request here in the WANTED section and someone might have a pair to sell. Should fit 81 to 87 regals.
I ocassionally find them at the yards, but presently there are no grills on the regals in the yards the I frequent. But they do come in from time to time. I will keep a look out for some next time I go to a yard for spares.
You can also just try a generic spring from the hardware store, but you may have to experiment with the level of tightness needed to keep the grill in place.
