I've found another PDF from The Encyclopedia of military vehicles - Kochnev E.D. In russian
Apparently there's a confusion between SOMUA (Societe d'Outillage Mecanique et d'Usinage d'Artillerie) and SOMAC.
"France
1986-1989
In June 1986, a new army jeep was unveiled in France, almost identical to its prototype Willys of the Second World War. It was a prototype CU-500 (4x4) with a carrying capacity of 500 kg, built by SOMAK, a subsidiary of the company Renault (Renault), and based on the units produced by her cars. Unlike the Willys, he received a glass-plasgik body and an all-metal welded base, on which a diesel engine was mounted, a 5-speed gearbox, two-way axles with differential lock, a McPherson front suspension and front disc brakes Reno. " Acceptance tests the car did not pass, and the air transportable version created in 1989 remained a model prototype."
Anyway he explained the misunderstanding.
I have to ask if I can post the link here?