Gerst Tubular Suspension (GTS) Swap

no. It comes with it's own spindles and brakes. It uses Mustang II forged spindles or Wilwood Pro Spindles which are based off the Mustang II.

Correct. I actually just ordered my kit for the Gen III Hemi Swap and will be doing this install soon. The build is going a little slower, but I get to really do all of this in detail and help everyone out if they need it like you have.