Metric hardware in brake parts (rant)

I feel OP’s pain. Was recently restoring the 4 wheel drum brake system in a ‘66 Fairlane. Rear cylinders were 10 mm, front right was 8 mm AND front driver’s was 7 mm! I felt like I was taking a toy wrench to the bleeder screw. Thank god it wasn’t froze or needed any real leverage/mechanical advantage.