Will the plastics off a 2005 ktm 125 sx fit a 2004 model?

The plastics from a 2005 KTM 125 SX are generally not compatible with the 2004 model. While both models belong to the same generation, KTM often makes subtle changes in design and mounting points from year to year. It's best to check specific part numbers and consult with a dealer or parts manual for confirmation.