This is not compatible to Citroen C5. There are no suitable PSA connectors. You'll not be able to connect it to car systems without cutting/reworking original connectors. The camera mount is smaller than the license plate light hole. It will fall out without reworking. The manual supplied is not accurate, it does not correspond to actual wiring. It definitely does not cost $26, this is too much for regular universal backup camera. You can find the same stuff for $10-12 price.