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Part #41 - Pacific Ocean
Southeast of the previous part is a series of rocky islands. Head there to find a space ship part hanging out atop one of the sets of rocks.
Part #42 - El Burro Heights
Head to the oil station in north El Burro Heights. Look for this large blue storage unit and enter the green unit behind it. Inside is another space ship part.
Part #43 - Murrieta Heights
This one is found in the dam in Murrieta Heights. Head to the side facing the city and climb down a few levels. Hop over the railing to reach the part itself.
Part #44 - Land Act Reservoir
Head to the Land Act Reservoir and look for the small wooden dock at the western end. Dive into the water and swim underneath the dock to find another space ship part.
Part #45 - Land Act Reservoir
Now head to the northern part of the reservoir to find some giant sewer pipes. Another part will be lying at the end of the runoff tubes.
Part #46 - Tataviam Mountains
To the west of the Tataviam Mountains lies a beach, and at its south end is a large rock arch. Next to that is a small sandbank where you'll find another space ship part.
Part #47 - Grand Senora Desert
It's back to the Grand Senora Desert for this one. The space ship part is located in the bend of the twisty road marked on the map.
Part #48 - Grand Senora Desert
This house sits by its lonesome on a winding road in the desert. Check under the banner in the yard for another space ship part.
Part #49 - Grand Senora Desert
Just before the Grand Senora Desert becomes Great Chaparral, you can find this abandoned house by the edge of winding road. Check the back porch for a space ship part.
Part #50 - Ron Alternates Wind Farm
For the game's final space ship part, look for this cave east of the Ron Alternates Wind Farm. Enter the cave and swim along the eastern bottom to find the part.
Finishing the Mission
With all 50 space ship parts collected, return to Omega. This time he'll be at Ron Alternates Wind Farm - right where we collected the final space ship part.
After a quick (and rather endearing) cutscene, you'll be rewarded with the From Beyond the Stars achievement/trophy. Plus, you now have access to Omega's garage...and the Space Docker rocket car!