the quickest way to find out would be to examine first hand. are they in the rear dash? open your trunk and see if u can see them. if not u may have to remove it(usually a firmly "clipped" into place, with other clipped pieces holding it down).
are they in the door? u need to remove the panel. not too hard to find the screws.
when i ordered a cpl 6x9 boxes from cruthfield, they sent me a fold out showing how to remove all the speakers and HU from my car.