Firm Feel UCA's Small Ball Joint pics and review.

...
They are very heavy and sturdy feeling compared to my standard UCA's. The welds look good and the bushings look like the ones I got from my PST poly kit. The ball joint looks like a better quality than standard replacement parts. The big bump stops are a very nice poly material and extra thick....

That's because it is a K7022 Moog upper ball joint. The ones you get in the PST and Just Suspension kits are not Moog.

The bushing seem to be the same for the cheap kits. But the idler, pitman, and upper and lower ball joints...Go Moog.