Well, no replies to this post, but I went ahead with it. I'm really pissed that the GM template for the spoiler install didn't align with my stock spoiler holes.
The Dovetail went into the existing holes and was centered and all, but I didn't know what to do about drilling the quarterpanels. Should I trust the template? Well, I measured six different ways, and made my own template. i only had to elongate one hole by 2mm, but it took me three days' of night work! Just the wiring to complete for the weekend drive!
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2012 ZL1
2010 2SS/RS:
Order # NJNJZJ: 2SS/RS, Blk/Blk, MT, Sunroof.
1100 = Preliminary Order: 10/28/08
0000 = Order accidentally deleted by dealer: 3/??/09
1100 = Preliminary re-order: 3/??+1/09
3000 = Accepted By Production Control: 5/21/09
3300 = Scheduled For Production: 6/2/09
3400 = Broadcast: 6/4/09
3800 = Produced: 6/17/09
6000 = Delivered To Customer: 7/1/09
R.I.P. = Totaled on 4th day driven in rain: 10/16/20