The parts manual calls for C292501-0104, which is a "kit" that includes the new switch plus new door locks and keys. The -0104 part number is no longer available through Cessna, but the -0106 part number is, and may work (call the dealer for applicability) @ $134.90 (EA).
Spectrum Aviation [
spectrumaviation.org] is usually less expensive for new Cessna parts.
Aircraft Spruce [
aircraftspruce.com] and others offer replacement switches at much better prices. (Call them for applicability.)