I posted this in another thread, looks like a good price.
$45.50 each with free shipping to the US.
I have not tried it, but looks OK to me.

Brand: BOSCH
Bosch Item Number: 0 261 210 170 - Also Replaces 0 261 210 171
Mercedes Benz #: 003 153 27 28 - Also Replaces 003 153 28 28
https://www.germanautosupply.com/sto...sensor-82.html
Cost $45.50 with free shipping to the US, $32 to Canada.