Even if you get caster camber plates I believe you still need to use the rubber isolators on your existing strut mounts or from the GT500 Strut Mounts. At least that was the case with the Maximum Motorsports Caster Camber plates.
First photo shows the GT500 Upper Mount and the thick rubber isolator. 2nd photo shows the 2 GT500 Upper Mounts. 3rd photo shows the wimpy stock upper mount and the 4th photo was the new strut assembly with rubber isolator from GT500 upper mount and the caster camber plates.
If your going to lower your car I recommend the GT500 upper mount rubber isolators and using caster camber plates. If you can get a hold of some used GT500 upper mounts you will save yourself some money because you only use the rubber isolator.
2013 GT, Track Pack
, Recaros, Kooks Axlebacks, Airaid CAI, BMR Rear Adj. LCAs, BMR Relocation Brackets
, JLT Oil Separator(s), Barton 2 Post Shifter Bracket
, Steeda Motor Mounts
, Barton Shifter
, JHR Clutch line, BMR adj. UCA and Mount, Kooks 1 3/4 headers/catted H, DSS Al Shaft
, BMR Loop
, Vogtland Sport Springs front/BMR rear, Strange Adj. Struts/Shocks, Extended ball joints, Steeda Bumpsteer Kit, Whiteline Tranny Mount Bushing, Borla Overaxles, BMR Watts, Vorshlag 3" Ducts