This is a new Shelby GT350 Specific Kit just released from Goodridge USA. The difference between this kit and the 12366 S550 Kit we have offered for the past 3 years is the front lines have added length and hose sleeving is added down by the caliper. While the former kit has been used without issues we are offering this kit due to these changes. Please see the picture which shows the difference between the GT350 Specific front line on the left vs. the S550 line on the right. Both kits will work on the GT350.