Dorman used to be a great name in "small parts," fasteners, freeze plugs, brass and copper fittings, draincocks, threaded plugs, cotter pins, the like. Parts stores would have a whole wall with chest-high drawer racks in orange and blue labeled "Dorman" on the front. Always top-quality parts.
Today, the name is the only thing left. The real Dorman company no longer exists, it was sold years ago. They are still a source for hard-to-find parts, but quality is hit and miss at best. Mostly chinese-made stuff. Buyer beware, don't trust the name anymore.