 In addition, 84 P-51Ks were also shipped directly to the RAAF from the USA.In late 1946, CAC was given another contract to build 170 (reduced to 120) more P-51Ds on its own; these, designated CA-18 Mustang Mark 21, Mark 22 or Mark 23, were manufactured entirely in-house, with only a few components being sourced from overseas.The 21 and 22 used the American-built Packard V-1650-3 or V-1650-7.