The GT500 mounts are a lot sturdier than the standard mounts. They only work 05-10 struts. It's a cheaper way to go and a lot of people don't want to buy caster/camber plates. There only $100 and work great. Thats about the only reason someone would choose to go this route, to save money. I did and I'm very pleased!
2014 Saleen Mustang White Label 14-013: Vortech V3 supercharger, Lund Tuned, ID1000's, NGK iridium plugs, Airaid CAI, BMR upper control arm and mount, BMR lower control arms w/ relocation brackets, BMR adjustable panhard bar and support brace, koni sport struts/shocks w/ GT500 strut mount, GT500 Brembo brake upgrade, CS fog lights, Stillen chin spoiler, Barton Shifter and two post bracket, Plasti-Dipped hood vents, and various Saleen parts and accessories.