Does anyone know who manufactured the trailers back in the late 80's and early 90's? Or what size drums and bolt pattern came equipped on a 1990 Pirata trailer?

I want to overhaul the brake system, but I don't know what parts to get. The trailer has 4 hydraulic drum brakes with hydraulic hitch actuator. Currently nothing works. I want to replace the actuator, hubs, and brake assemblies. I was looking at all the options available on E-trailer and realized that I don't know what I have.