The very first Sisu cabins were self-produced with vertical windscreen but later they were reshaped to a more sleek appearance. External producers were used already since end of the 1930s. The common practice was that the customer selected the cabin supplier. Some of the cabin suppliers were Auto-Heinonen, Messukylän Autokoritehdas, Valmet, Tampella, Ajokki, Lahden Autokori, Kar-Pe, Linjakori and Kiitokori – the last one was the most significant supplier during the 1950s and 1960s. Also the SAT-owned Karia was a significant supplier. Some Jyry-Sisu's sold in Sweden were equipped with locally produced Be-Ge Karosserifabrik cabins. Until the 1950s the cabins had typically a wooden frame. The first completely steel structured cabin came in 1955 introduced Sisu KB-24. The structure was soon adopted also in other Sisu models. The diversity of cabins was narrowed down at the early 1960 when structurally integrated cabins became more common. A typical example is KB-112/117 with a tiltable cabin.