if you want to use the rainbow car I would recommend using this plugin https://bakkesplugins.com/plugins/view/103 or you can use the design without the plugin your choice
clean rainbow
1533 Views
BakkesMod Car Code
ww1JDFyATECJRKzJjB3AxSrvlD6mYBNwJAIABy7AIJhJgkUOhgrLtArIQarBC1iD/wAAXwAAAA==