The spare parts of Victon TPMS could be purchases separately here. To purchase the spare parts， customer need to provide image of original invoice (or any other proof of purchase) to prove that the original VICTON TPMS system are purchased from MyVicton.com or any other retailer of MyVicton， this is a security measure to protect MyVicton customer so as to make sure any stolen sensor could not be used without the accessory.