I would like to know the exact differences between 68S and 68T (Street Pack and High Performance Braking Pack). Ford marketing does a terrible job describing the exact changes/differences in these option packages. It sounds like 68S comes with the 21" wheels, all-season 275/45R21 tires, upgraded rotors, and red calipers. 68T seems to only add different brake pads to be installed at the dealer after shipment, which is insane for an extra $600 or so. Chances are the dealer will do one of several things: A). Deny that there are pads to be installed. B). Claim they were installed but not, and the mechanic would pocket the pads to sell for money on the side. C). Actually install them and cause problems during installation like scratch the vehicle, damage the parking brake assembly, marr up the wheels, or D). Perform the swap and everything is fine.
It would also be helpful to see if either 68S or 68T includes different programming for the stability control, or adds extra coolers for the transmission, front differential, transfer case, and/or rear differential. These were not explained very well in the order guides, and the order guides have been misleading in the past (for example my 2014 SHO order guide didn't explain the Performance Package very clearly).