My experience with FMS fuel injectors is:
Orange/Tan = 19 lb/hr typical Stock Mustang
Blue = 24 lb/hr typical Cobra Mustang
Red = 30 lb/hr
Green = 42 lb/hr
OE Ford 24#ers are Blue with gray bodies. I think Mark 8's and 460's came with these with an F2 part number on them.
There is also a ford racing version that is the same shade of blue but with black bodies.
I forget who made these injectors. Bosch or Denso. I've also seen aftermarket injectors (Accel for instance) that don't follow the typical color convention and are completely black.