Dart Suspension Rebuild Kit on Ebay Opinions

Made in USA don't mean as much as it once did. Reason being, the quality of raw materials is pitiful everywhere. Metallurgies have been reformulated again and again. New formulas look good in lab test reports but don't survive in the field. Two best examples of the raw material factor I have...
Fords OEM brake rotors that flaked apart like Mica after exposed to salt brine. DOH! Recall
NASA paying Snap-On 9.25 for a single 3/16 allen hex 'L' key made of premium quality material. You don't travel that far from Harbor Freight, Sears, wherever, and break their tool. Both examples from at least 20 years ago.
We can't know how much Moogs cast iron and forged steel has changed over the years. We can assume that if they paid todays price for yesteryears raw materials we couldn't afford their products.
It aint all bad news though. The machined surfaces on newer material blends has vastly improved. That's part of the reason rotating assemblies like engines last so much longer today.
Bottom line... Good luck with anything you buy.