Want to add a car available as a Saints car

I want to make a mod that adds the "Phoenix" car with certain customizations (Pitch black paint only) as an available Saints car that I can select in the Mission House. Can anyone help me with that, starting by which file (s) extracted from common.vpp I need to edit?
 
Car_2dr_muscle04 seems to be Phoenix but Im still hopelessly lost on how to add a customized version to gang customization. In gang_customization I can only see the names of available cars and no indication on how they are colored purple
 
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