Help wg. ABS sensor! Please help !!m

Hello people at my ball year 2001 CDI I have the following problem: The tooth ring on the rearmost drive axes for the ABS sensor has broken out in two places. The nice smart dealer wants to earn 600 euros with now and sell me a new shaft right>left! He says the parts are not available individually! Now my question: Are there these tooth rings for the scanning of the abs probe individually? Please mail me at: [email protected] DANKE 1000 Time for your quick help!!