Your search for "trailer hardware" revealed the following:
Do You Really Need a New Trailer Axle?
A bad hub, noisy bearing, worn brake, or damaged spindle can make it feel like the entire trailer axle is finished. Sometimes it is. But many trailer axle problems are actually failures of the serviceable parts attached to the axle — bearings, hubs, drums, brakes, seals, or the spindle —...
What Trailer Brake Assembly Do I Need?
Trailer brake assemblies are not selected by diameter alone. Two backing plates can look nearly identical and still be incompatible because of shoe width, axle rating, mounting flange, left/right orientation, adjustment style, drum size, or brake type. Match the system, not the appearance. Start with the brake dimensions and axle...