 Later models employed a torsion bar suspension set up.In 1974, Peugeot acquired Citroën, forming the PSA Group, and the project to replace the Ami was redefined as "Citroën VD", and then incorporated the floor pan of the Peugeot 104, thereby permitting the use of the 104 engine and transmission.The 5-door 104-based Citroën Visa thereby replaced the Prototype Y.