You get this quest after completing Wharfmaster Dizzywig II. Speak to the goblin wharfmaster in Ratchet and he will say:

Here's Kravel's package. And when you deliver it, tell him... if he wants more special orders, then he'll have to pay his tab!

Travel to the Shimmering Flats
Speak to Kravel Koalbeard

Off you go, back to Thousand Needles, the Shimmering Flats and the Mirage Raceway. Find Kravel Koalbeard, speak to him and give him the package. He says:

Great, you got them! Now we need to get them to the gnomes. But first?

Let?s take out one small item?

After he?s done speaking Kravel begins to fiddle with the box, so wait a few seconds and he will have more quests for you. Completing this quest open up for no less than three new ones, and they?re called Delivery to the Gnomes, Hemet Nesingwary and Rocket Car Parts.