Bolinder-Munktell introduced in 1957 two slightly smaller combine harvesters than before. The MST-751 was equipped with a 7½-foot cutting width and a threshing mechanism 69 cm wide. Initially, the engine was a petrol-powered Volvo Penta, but from 1958 onward it was also available with a Perkins 4.270 diesel engine. The larger MST-901, like the bigger BM models, had a 9-foot cutter bar, but the threshing mechanism width was 91.5 cm instead of 110 cm. The engine was the same 6-cylinder Volvo Diesel as in the MST-95. The rasp bars were slightly shorter.

BM’s special features included an “endless” unloading reel, a water-cooled exhaust pipe, and a bagging platform also on the grain tank combine. The unloading pipe was detachable for transport and placed behind the tank. There were still 4 speed options for the threshing drum, but now the operating speeds were usable in the range of 800–1100 rpm.

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