That's a steering knuckle.
You want the entire knuckles with spindles and the hubs. The bearings press into the knuckle and the spindle/hub presses through the bearings with a retaining nut on the back side.
Good luck finding just one side though. They are fairly scarce as it is. You'd probably have better luck with the salvage folks than here.
The only way you'd get one here is if someone does an SAS but then they would want to sell them as a pair including CV axles and lock out hubs.