Additionally the 518 was produced outside Italy: in France by Simca as Simca-Fiat 11 CV, and in Poland by Polski Fiat as well as by PZInż under licence.

The 518 L chassis was fitted with wider tyres (5.50×17″ instead of 5.25×17″) and a different final drive ratio from the 518 C.[1] Both the 518 C and 518 L were offered from the factory with 4-door saloon and 4-door torpedo bodies.

In order to negotiate rougher terrains it had larger wheels and tyres and a shorter final drive ratio, leading to a reduced top speed of 85 km/h (53 mph).

It was offered from the factory solely as a 4-door, 4-window pillarless sports saloon, with four seats and an external luggage compartment integrated in the body.

The Ardita Sport's type 118 AS 1,944 cc engine produced 54 PS (40 kW; 53 hp) at 3,800 rpm, and pushed the car to a top speed of 115 km/h (71 mph).