The DN163K2 will fit into the Kato RS2 and RSC2 locomotives with the same frame design.
The decoder is also installed using these same steps in the SD90/43MAC.
Kapton tape should be applied in the saddle area of the frame above the motor to prevent shorting.
Install the DN163K2 decoder into the frame by tilting it slightly as you insert the front corners into the forward frame clips.
Press the decoder motor clips down over the motor contacts and slide the decoder board forward and press the board down into the frame.
Be careful not to bend the motor contacts or let them come in contact with the frame.