Better... Stronger... Less Dead

Because the quest objectives are less than clear, you need to kill the HK-3 Aerial Dissuasion Unit that patrols off the west coast of the main island, the Insurgent Crawler wandering around the northern wall of Junkwatt's Depot around 54, 54, and the Insurgent Cycloid, which wanders in the area around 54, 28 above the trog dens. Each will drop one part needed for the quest.

mew4ever23's comment was a great help, so I wanted to add some information.

You'll need these:

• Neural Accelerator
• 
  
• Omni Electromagnetic Amplifier
• 
  
• Flux Energized Servos

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(That's the order in which the items appear in the quest log.
Going to the north, then south and then southwest, I found this order easier:)

If you just want something to paste into a macro, for use with TomTom, here:

/way Mechagon Island 55 25 Insurgent Cycloid
/way Mechagon Island 53 52 Insurgent Crawler
/way Mechagon Island 34 75 HK-3 Aerial Dissuasion Unit

.
For this: Omni Electromagnetic Amplifier
Kill this: Insurgent Cycloid
Go here: /way 55 25
(Go south of the "R" of, approximately level with the entrance of the cave under the word, "Scrapbone Den".
To the left of Uncle T'Rogg's cave is a gear suspended in the air. It's through a gap in the rocks, behind that.)
Note: This NPC moves a bit southeast of this point, along a ridge, which is where I saw it spawn.

For this (these): Flux Energized Servos
Kill this: Insurgent Crawler
Go here: /way 53 52
(Go south of the previous point, under the "S" of "Scrapbone Den", just north of Junkwatt Depot's northern wall.)
Note: This NPC moves in what looks like a clockwise direction, then southeast to and along the wall.

For this: Neural Accelerator
Kill this: HK-3 Aerial Dissuasion Unit
Go here: /way 34 75
(Go southwest of where it says "Junkwatt Depot", approximately level with the "O" of "The Outflow".)
Note: This NPC moves a touch south and quite far north of this point, which is where I saw it spawn.

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Please note that I have deliberately use whole numbers for the waypoints. This is because the NPCs move and one experience will differ from another. Go to these points and you'll see the NPCs nearby. If not, then the NPC has been killed or is moving. Wait a few seconds and you will see the NPC.

You can always use the good old target macro (which targets the NPC and puts a raid marker on it, to make it easier to see):
(Replace "Insurgent Cycloid" with the name of whatever you're looking for. I leave the icon on my action bar and just tweak the macro, as needed.)

/target Insurgent Cycloid
/stopmacro [dead][noexists]
/run SetRaidTarget("target", 6)

For those vaguely interested in Blizzard's pop-culture references; this is a reference to the opening sequence of each episode of "The Six Million Dollar Man", a show about an astronaut who, following a near-fatal crash that destroyed some of his limbs, was 're-built' from cybernetic parts.

The dialogue is as follows: "We have the capability to build the world's first bionic man, Steve Austin will be that man. Better... stronger... faster."