After the War FN built unit construction sv and ohv 249 cc, 344 cc, 444 cc, and 498 cc models, and two-stroke models from 49 cc singles, to 248 cc twins. The two-stroke models used German JLO engines. The semi-unit engined Tri-car was released for civilian commercial use as the Tri-car T-8, with a five-speed gearbox. In 1947 the M.XIII was available in 250 cc ohv, 350 cc ohv, 350 cc sv, 450 cc ohv, and 450 cc sv configurations. The first model used an unusual patented Swiss coil sprung girder front fork and a new rubber rear suspension.