Judgment of the Court (Fourth Chamber) of 24 January 2019.#Directie van de Dienst Wegverkeer (RDW) v X et Y, X and Y v Directie van de Dienst Wegverkeer (RDW) and Directie van de Dienst Wegverkeer (RDW) v Z.#Request for a preliminary ruling from the Raad van State.#Reference for a preliminary ruling — Directive 1999/37/EC — Registration documents for vehicles — Omissions in the registration certificates — Mutual recognition — Directive 2007/46/EC — Vehicles manufactured prior to EU harmonisation of technical requirements — Alterations having an impact on the technical characteristics of the vehicle.#Case C-326/17.