I had to purchase an aftermarket part for my motorcycle to replace the upper belt guard. I ordered the part from an American company to fit an American Motorcycle. The part did not come with the bolts to attach it, because those were assumed to be already on the bike.
I rode to my brother’s house to work on the bike in his garage, as he has good tools. When we attempted to attach the new part, we discovered that, although the holes for the bolts were the correct size, the THREADS inside one of the holes were METRIC instead of American! We spent the better part of the day searching for the correct die to change the inside of the threads to “Murican”. We finally got everything to fit and it looks awesome.
But why on earth would a part designed for an American Bike, measured to FIT an American bike, using American Standard measurements, not includimg hardware as it would be assumed that one would be re-using the original American Hardware on said American Bike, which had been designed and manufactured IN America, using American Standard Measurements, and have the inside threads of ONE of the two bolt-holes be METRIC?
It’s a Mystery.
My goodness....that is quite the mystery.
Just for your own edification can you backtrack and find out WHO would use metric anything?