The M1078 military truck was originally a Steyr of Germany design. Stewart and Stevenson of Texas bought the license to build it in the US, for TACOM. Ever try to find tons of 10mm steel plate, metric switches and non-aircraft metric hydraulics in the US? The Cat engine's mounting holes were Imperial... The whole truck had to be redesigned in Imperial units, much to the royalty in Houston's bafflement.. What was supposed to be a 6 month conversion turned into a 3 year rebuild.
US auto makers had mixed vehicles for years. Crazy to have to have both types of tools on hand.