Im not sure if renault do these separate or not however it may be easier just to get one from Clio Spares for cheap and get them to post it. Here is there website would recommend calling them though.
http://www.cliospares.co.uk/
There pretty easy to fit i took mine off just to clean around the sensors pull the door seal out then squeeze your hands behind to push the sensor out and feed the rubber lip around the grove in the sensor.
http://www.cliospares.co.uk/
There pretty easy to fit i took mine off just to clean around the sensors pull the door seal out then squeeze your hands behind to push the sensor out and feed the rubber lip around the grove in the sensor.