1999 Park Avenue Ultra Radio

I'd like to find out if my 99 PAU's radio has the CD Changer port on the back so I can use this http://www.logjamelectronics.com/piegm10aux.html to add RCA inputs in order to use an MP3 player with the existing factory head unit. I just got the car and am not a genius when it comes to automotive matters. I'm hoping to mine the wealth of info here. PLEASE HELP!

Probably not. I just went through this exercise. My radio had the single CD. Look for a button on the radio that says source or maybe changer on it. If it has that you might be good. Best way to tell is just pull the radio.

I do have the source button on the lower left of the radio's face. This is an AM/FM, cassette, and single cd radio. Hopefully, these extra clues will help some more. Thanks for the reply.