read this-http://www.fordmods.com/post1215325.html?hilit=dash tweeters#p1215325,they plug in to wiring,nf had the premium sound.2 tweeters in top dash,2- 6 inch in front doors\paper cones may be water damaged,2-6 inch rear self,amp in boot guard rh rear,6 cd stacker inboot under the self.power areial.spelling sucks,eye test tomorrow,again.2-3 months.all the wiring is there with the plugs.ef is pioneer,el is alpine.ltd has a 10 inch sub stock.

The EL I am wrecking out is all Pioneer.
From memory all later model stuff was Pioneer and it was EB and ED that used Alpine gear?

Sweet pick up, it's a Concorde yea?

el stacker was alpine,im not sure about amp.

Yeah if memoray serves correcto , stackerwise the y changed a couple times you see alpines in ome el's differnt plugs I believe to ef...
also theres a mix of ford branded vs alpine etc.

to be honest though I can't say as these cars are 13-22 years old, and every unit had an individual life.
treated difffernt way, when part failed not all replaced with the correct oem part. atleast e series are relatively new comparedto my 59 ranchwagon, accurrate info even more scarce, no the didn't come with clevo's factory.... etc.