The front brakes are cross drilled and Vented Wilwood 12" discs with 4 pot callipers. These are a direct replacement for the standard Mustang II discs that are only 9 1/4" Diameter.
Here is one of the discs assembled and on the spindle. You can see the 4 pot calliper and the large 12" discs.
Here you can see the discs in place on the front end of the chassis. checking out fitment and clearances.