If you can reach behind the bumper I would glue a small square piece of plastic behind the hole then poke a couple small holes in the plastic patch then cover that patch with a thin layer of bondo. The small holes in the plastic patch should allow a small amount of the bondo through giving the bondo something to grip. Get some paint from
http://www.automotivetouchup.com/?A=437 ... %20paint_e
you should have some paint anyway for the stone chips and scratches.
Does anyone else have this on their rear bumper?
64 Galaxie 68 Olds 442 65 Impala 70 VW Bug
74 Nissan B210 66 Chevelle 73 Olds 98 71 C20
75 Monza 82 Escort 75 E150 75 Civic 76 Accord
86 Escort 87 Taurus 83 Chevy G20 85 Ranger 4x4
93 F250 4x4 95 Silhouette 95 LHS 03 Corolla 10 Kizashi S MT
17 Sienna
74 Nissan B210 66 Chevelle 73 Olds 98 71 C20
75 Monza 82 Escort 75 E150 75 Civic 76 Accord
86 Escort 87 Taurus 83 Chevy G20 85 Ranger 4x4
93 F250 4x4 95 Silhouette 95 LHS 03 Corolla 10 Kizashi S MT
17 Sienna
There's a company that makes ready made plugs for the front bumper (bumperplugs.com I think). I'd talk to them and see if one of those will work. They come pre-finished and guaranteed to match.
Thanks for all the advise. Its been raining non stop in upstate NY. The one day it didn't I got underneath the car to try to remove it. I dont understand what the hell happened but that screw was bolted on with a washer and a lug nut. It was rusted solid and I was out of WD40. I could not get that damn thing to budge. Its bugging me that I do not know why that was purposely put on. I'm going to wait until I do my oil change and ask my mechanic to pull that out while up on lift.
2012 Kizashi CVT AWD/ w paint chips 
Orange County/Brooklyn NY

Orange County/Brooklyn NY