Most things on our Fords seem to be metric. At least what I've needed to take off or tighten.Thank you for the cultural clarification-
I understand that even in the U.S., metric measurements are used in engineering-
Myself found it made my life easier with boat maintenance regarding mix ratios of polyester and epoxy resins in addition to measurements for modifying openings for the new 316 stainless portlights I used to replace the old crap aluminum (aluminium) ones-
That's because we're switching to metric. It's just taking a century to do it!