So if I just want to get a new CD Player/Head Unit how can i be sure that it will plug in right to my cars factory stereo/speaker system. I have a '99 Civic EX

 

Well if your shopping on circuitcity they have something where you just type in the name and year of your car and it will tell you what fits and what not fits on your car. Just see what fits out there and shop for it that way.

 

what about this one: http://cgi.ebay.com/JVC-KD-HDR1-CD-M...QQcmdZViewItem

 

i have an aftermarket JVC and you'll need to buy a conversion wiring harness. anywhere from $20 to $40.

or you could manually convert the wiring but its a PITA.

 

Where could I get these wiring harnesses? Do all aftermarket headunits use s specific type of wiring output? (not preamp out puts but the ones with all the wires that u need the adaptor for).

 

I would think places like crutchfield and BestBuy would have those harnesses. If you buy it at Best Buy they install all that for you free, if you buy the deck from crutchfield, providing that they sell it, you will get the harness and connectors along with it.

I don't see any reason that one wouldn't fit your dash, as long as its a standard size.