Alongside the 533, which was based on the FE-35, IMT also manufactured the 551 in Yugoslavia, which was based on the MF 65. It was equipped with the first version of the 65’s 3.1-liter engine. Alongside it, IMT began production of the 50-horsepower 555 in 1963. The 555 was noted for having a completely new dual clutch. The power take-off gearing was still the same as the early MF 65 models, meaning that at 2000 engine RPM, the PTO shaft rotated at 720 RPM. Instead of the MF’s disc brakes, drum brakes were used. IMT’s sales program also included an extensive range of implements designed for the 555, covering everything from a corn planter to, for example, a reversible plow that was turned only 90 degrees back and forth.

The successor to the 555 was the 558, whose 3.3-liter M34T engine had 56 hp. Its appearance was still similar to the original towards the end of the 1970s.

IMT’s larger tractors were also manufactured by IMR-Rakovica, which produced engines for the main factory’s products as well. At IMT, the engine color was gray, while at IMR it was silver. The model designations were different; for example, the IMR R60 corresponded to the 558.

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