Help measuring bolt pattern

A little Google shows there actually ARE people calling 5X4 by the metric measurement of 101.6. This is totally stupid and wrong!!! This would be like, EG, converting 1/2" pipe to metric and going around expecting plumbing stores to carry "12.7mm pipe"

"You guys have any 9.525mm bolts?"

"Uh, whut??"

(3/8 bolt)
yep - ran into it a few years ago when I was looking for wheels for a different maker vehicle and was trying to figure out what other original type wheels might fit.. what the WHAT is going on!!