1998 7.4 vortec in a 1961 Ford Body With a chevy blazer Frame.

[BeXtreme]

The top one with the four bolt holes looks like what goes on a HMMWV upper spindle. Probably used on other things, but that's the only place I've personally seen them.

 

[HotWheelsBurban]

Looks like the uppers on my Burb, most of the C series GM trucks use a bolt in UBJ. Riveted from the factory, but I don't think they'd been replaced on my Burb and they were definitely bolted in!

 

[Erik the Awful]

The top definitely looks like a GM ball joint. I'm not sure who uses a press-in ball joint like the bottom. Put tack welds on those suckers! You get crazy steering when one of those comes loose. Ask me how I know.