[Mike Kelly]

A theory: The military 1941 De Soto ute I had , had the typical Aust. army requirement , where the nomenclature was stenciled on the firewall, I recall in that case, the model was SP11 . Reading the list Hanno uploaded ,I see that the 'S' was possibly meaning 'Special' . These Plymouth based army utes had heavier rear springs fitted than the standard sedans, and possibly other chassis mods. Maybe the 'S' covered those mods.