All I know is that the parts have a Donvel label and a patent number along with a statement that other patents are pending. I'm not familiar with Brock products. I got the valves installed on the rear and the front airbags installed except for the airlines. So far the process has been pretty straightforward except that two of the bolts in front are tough to get nuts on inside the frame. That might be different on other model trucks. The air fittings are push-on. Another couple hours to get the air lines run thru the firewall and mounting the gauges and I'll be ready to roll. It might be a few days until I can get back to it.
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