There’s a bit of myth around Dinky vehicles. 1:43 vehicles are the standard size, the story goes, because Meccano made Dinky-brand 1:43 vehicles to go with its Hornby-brand trains. But that’s part of the story. Dinky models of American vehicles were 1:48, to go with American O scale trains.
Dinky produced 1:48 diecast models of American cars from the late 1940s well into the 1960s. While they can be expensive, they hold their value well. Model railroaders who don’t want to pay collector prices can buy beat-up Dinky models and paint and detail them as they like.