@Robotstar5 The first time I came across odd size bolts & nuts was using Durlok stuff when I worked at a commercial bodybuilders a few decades ago, Having to get a couple of extra size impact sockets because the kit I had only did the then common sizes, Volvo trucks stick in my memory for always mismatching heads to bolts and they were always a mm or 2 smaller than all the others so I had to get even more impact sockets just to fit their trucks