Now you've narrowed it down to two models.
It's not the uber audiophile JBL model or whatever it's called.
So it's base or premium model.
It's easy to pull out, that's what I ended up doing.
You notice that in that link there's only vague mention of 96, apparently rear plug style changed in 98. There's the P100 harness consisting of two plugs for the 1.5 DIN radio/cassette. It's full size (double DIN) in the front and thin in the back (single DIN) means you have an amp (probably, maybe). The harness is one long 8 pin plug and one squarish pin.
In 98 at least some of the radio head units had the amp built in and can be used with an adapter kit that bypasses the amp in the cargo space.
There's a statement that 95-01 units will fit. Well, ok they might physically fit in the opening, but there's more to it than that.
The aftermarket units are better depending on what you want, but then there's adapter plates and all that to fill the rest of the opening. Unless you put in a double DIN GPS/DVD/Dishwasher/stereo thingy
Ford used a lot of sound engineers to make it so confusing.