I hope this helps the guys who want to know how to remove the nose cover on the SS. I pulled mine to do some work and when putting it back together, used brand new Push retainers from clipsandfastners.com
A12757 GM Push-Type Retainer 1" Head Dia. 3/4 Length for 1/2" Hole.
They come 15 to a package, and you'll need 16 total. Hey, you'll have some spares at least. These are the OEM parts. If you can salvage one of the old retainers, then a package of 15 will do fine.
To begin with, remove all 8 retainers across the top, and all 8 on the bottom. If you're replacing with new retainers, the bottom 8 are easiest to remove by simply sliding a putty knife under the head and whacking it with a rubber mallet to cut the old head off.
Once you get all 16 off, remove the screws at the very bottom which hold the air dam on the bottom of the nose to the side extensions on the fender. These are the two purple arrows in the pic. Right click on the image and select "View Image" to see the pic full size.
There are 7 screws holding the nose to the fender on both right and left sides. These are in blue.
These are the corresponding 7 screw locations on the fender itself. Again, in blue. A 10 mm socket will be needed.