Figuring out the location from the clue, and collecting the chassis, will allow the player to collect the other four parts required for building the 1955 Chevrolet Bel Air. The individual locations of the parts will be given to the player in the form of four clues;
Collecting all five parts will allow the player to built the 1955 Chevrolet Bel Air at Rav's garage on Airfield 73.
The Bel Air chassis can be found along the north wall of the Ark Tower construction site in south Silver Rock.
Nearing the part will trigger a sonar beep, and will increase in rate as the player nears the part. Collecting the part, once prompted, will deliver it to Rav's garage on Airfield 73.
The player is required to complete the Jess: Runner questline in chapter 3 - City Lights, before they can collect the chassis.
Collecting the chassis will deliver it to Rav's garage on Airfield 73, and will give the player four clues that point towards four other parts required to build the 1955 Chevrolet Bel Air.