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Actually, those are easier tahn the way I did it. Other members have put them in from the front through the brake vents with no trouble and a lot of TLC.
Are You talking about the front Z06 screens or the rear side brake cooling screen?
On mine we cleaned the upper and lower area of the front air scoop, loaded up so black silcone on the top and bottom of screen and set them inside. Took about 10 minutes and have not budged in 6 months. When I got instructions I decided there was NO WAy I was going to jump through those hoops unless I had too and so far the silcone has saved me the time. NOW the side brake scoops where a WHOLE different ball game. Cutting a HUGE hole in the body of a new C5 is SCARY!!