Its the wire clips that secures the electrical connector to the injectors. Also looking for the securing clip that holds the MAP sensor into the manifold, Had a bad weekend loosing these small bits. Zip ties just dont look right!
Cheapest option is scrapyard and cut them off and solder them into your loom. There are loom repair kits avaliable from renault but they aren't cheap and pretty much the same as cutting some off a scrappy just the renault ones will have longer tails and cost 20x as much.
sorry my description was poor. Its only the securing wire clips you have to push over the electrical loom connector when its pushed into the injector. Its there to hold the loom connector onto the injector.