There is no plug and play harness when going to the 2008 upgrade , but a lot of the 2008 mirrors come with the plug to plug into the 2002 harness then you just need to wire in the heat, turn and marker light. Not to hard just a little time. Probably hardest [is finding power for the heated mirror. Have it kind of figured out for mine ,1999. just have not found the time to do it.