Graphic Equalizer

I have a 1988 T-Bird sport coupe that didnt come with a graphic equalizer. I have been able to find two with different types of radios . In either case, I cannot find the 10 wire male plug that is required to operate the equalizer in the stock wiring harness. According to the Ford dealer, there was only one harness made for this car. I will have to tear apart the whole instrument panel to find it unless somebody knows the secret, or that there might have REALLY been two harnesses available.
ANY help would be appreciated!

i didn't think the thunderbird's ever came with a graphic eq.

I think they have offered them as an option since 1984, I know they offered them in 86, 87, 88. I just bought one from an 87, to put in my 88, but you saw my post. Im hoping some Ford Assembly guy out there knows how they originally went together. I sure cant find a plug for one in MY wiring harness.