I have the new speakers, but have not started the replacement yet. Can somebody who has just gone from stock to the 638's tell me what type of connector is required? Are they just "plug and play" or do you have to modify either the harness or new speaker connection? I just want to have everything I need before I get started... I'm definitely not good with "wiring" issues. Last time I installed an aftermarket cd player in a little Honda, the subsequent owner (a close friend) experienced an electrical fire