The US is one of the only countries using the Imperial SAE sizing system for nuts, bolts, screws, washers, etc. The rest of the world uses the metric system. Metric sizes should be abundant and CHEAP! I found otherwise looking for exact types & sizes for an import auto restoration project. I also learned the hard way about hardness grading.
John Dsuban Spring Service sells and installs Centramatic Balancers.
Patented Centramatic Balancers are a unique line of “On Board” Balancing Systems for tires and wheels that maximize tire life and smooth your ride. Mounted behind the wheel they offer permanent solutions for balancing assemblies. Centramatic Balancers operate automatically and can adjust instantly for changing conditions.
Centramatics are available for Trucks, Tractor/Semi Trailers, Coaches, Buses, Delivery Vehicles, Motor homes, Trailers, Large Pickups, Jeeps and Police Cars. We even custom build for application-specific centrifuges.
https://www.dsuban.com