Lower priced Power lok, sure grip units on Ebay.

20 years ago I sold Yukon 8.75" Power-locks, which I re-worked. The Chinese power-locks on eBay appear to be a copy of the old Yukon offering.

10 years ago, I had my own version made, which I assemble in-house. None of the components are made in China and they look completely different than those sold on eBay. See below:
Mopar 8 3/4" (8.75) Clutch Type Sure-Grip ("Powr-lok")