Three replacement vans built by the Railway Company in-house at Douglas Station and using underframes from former four-wheel passenger carriages.  K.13 (ii) used the frames ex-C.3 (later transferred to the chassis of B.1 in 1949) and was later scrapped, K.14 (ii) used B.18's frames and was scrapped in 1961 with K.15 (ii) being built on the frames of B.16 and scrapped in this form in 1958.