The Mk.5/1 (Aust) with the designation used to identify the vehicles with a range of modifications basically equivalent to the Mk.10 except retaining the 20pdr gun with type B barrel that included the fume extractor. Other notable alterations included additional applique© armour added to the glacis, the inclusion of an additional RMG (Ranging Machine Gun) in the form of a .50cal MG added through the mantlet next to the standard .30cal co-axial machine gun, plus a number of other local modifications. With the deployment to Vietnam in 1968 further modifications were added due to operational experience. and the kit includes many of these modifications faithfully.