This listing is for a pair of new but old stock, Sigma AC20S ultrasonic sensors, with mounting brackets and screws. 

Ultrasonic heads do become less effective overtime as the heads "harden" during use, over time. No programming is necessary to fit the new items and they plug directly into the sockets on the alarm ECU.

These ultrasonic heads have not been fitted, and are bagged as new.

Compatibility:

- UK Subaru Models 1999 to 2001:

- Sigma M1, M2, M3, M4, M10, M12, M20, M30 and M34:

Direct replacement for all Sigma M-Series models  The heads plug directly into the TX and RX sockets on the alarm ECU.

Any questions regarding this item and/or compatibility, just e-mail me and I will be able to advise.

Postage within the UK mainland only I’m afraid.

Thanks for looking!