Mine were made in the USA, but keep in mind they were purchased 5 years ago, before the you-know-what hit the fan. Perhaps things have changed today. Like you, I'm not a fan of "offshoring". To save time, install the studs in the hubs with a ball joint press and pack the bearings with grease. I don't see why you couldn't use the RL, I used Amsoil on mine. If you opt to shorten the DT studs, you can cut them with a whiz wheel on the vehicle, just put the lug nuts on first. Your biggest time killer will be removing the original unit bearings from the knuckle. I believe Snap-on makes a special tool for that application. If you're also replacing the U-joints (recommended) you can pre-install the cross in the DT stub shafts before you start the project.