I kind of agree with what Mike said.
The late eighties and early nineties had a lot of people wanting to add stuff to there cars that were different.
Outside of Saleen and a few specialty packages from dealerships (Dominators, etc....) it really doesn't add to the value of your car. What I think you have is a mustang that some one customized with stuff they liked at the time.
Doesn't make it wrong necessarily, but Mike is right, you have a very clean GT that would be worth more in it's original form.
But just to answer any upcoming questions about your extras. I never have seen a styling bar like the one you have. The addition of the Ford emblem tells me that someone put that in there at one time just because they liked it. The emblem really should come off of the dash as well.
Again, you have a very nice mustang, focus on that, I'm not bashing at all. I don't believe you have a special package though. I've worked on these and other cars at Ford dealerships since the 1970's, I do have some knowledge about fox body variants.