The OE bushing is not a part that can be bought by itself. A new arm already come installed new bushings, so it's a good option if you don't want to go through the hassle of removing the old bushings and drive new ones in. You can always replace the ball joints later, but why not replace them when they can fail eventually.
Remove the cotter pin and the castle nut, but do not reuse the cotter pin. If you're changing the ball joint anyway, don't worry about destroying the boot. Use a ball joint removing fork or similar tools to detach it from the spindle. Remove the two nuts and the bolt that is bolted onto the lower control arm.

This is where I messed up. Check if the front lower control arm bolt is in the way of anything before you begin. If you have an automatic, you'll need to drop the suspension crossmember sub-assy to gain access to the bolt on that side.

Then you just remove the bolt and nut that holts the back of the arm.

The arm will come out after some effort.

Now to the first time-consuming part: torching the bushing off the arm. The small ones aren't too hard to melt

A video can worth a thousand words. Heating up the rubber long enough will get it to burn itself. The bigger one will take quite some time to be burnt off.
Make sure the holes is as smooth as possible (no rubber residue). You can use a file to get the remaining rubber off.

The metal sleeve inside the big bushing is reused. It's sandblasted for a smooth finish and rubber-free after scrubbing most of them. The actual bushing (centerpiece) is pressed in as careful as possible. The metal sleeve is pressed inside the hole. Once you put the top and bottom caps on, feel free to lube them so you can have a much easier time sliding it back later.

The smaller bushings are best to be lubed and placed inside the hole. Then the metal part of the bushing is driven into by a small bushing driver.
Since only one side is installed, it's not very difficult to feel the difference. No, it's not something that will make your car ride stupid rough. How long will it take to do everything? 4 hours is a good time for a shop, but I'd say a good day so you can have some beer with your friends and have a good time.
For the MOOG ball joint, it comes with a separate grease fitting (or better known as zerg fitting). Fill the ball joint with a grease gun, then put the supplied regular screw back on.





