Lynski,
Some have swapped in the Thunderbird Supercoupe fans, some have used the Old early 90's Taurus fans, others have made others fit as well. I do not know of any direct fit, same plug fans though as each of these mentioned will require some form of modifying. But in actuality, the stock dual fans are pretty effective at cooling. The primary comes on when the coolant temp sensor reaches around 210, and if the car needs more, the secondary will kick on and provide full cooling. I have never seen the secondary fan come on unless I was running the A/C on a hot day. Personally, I think the stock set up looks good, works good, and fits, but the biggest item to go bad is the coolant temp sensor in the intake between the fuel injectors. Many of the aftermarket ones seem to be either calibrated poorly or just don't play nice with the computer. Mine had issues where it would go right into the red and the fans would never kick on. I trouble shot everything, relays good, fan check good, put a new sensor in it, never worked as original until I went to a junkyard and got a factory Ford sensor from an older Crown Victoria 5.0. Put that in my TC and it has worked fine for the past 2 years, even driving around here the past couple of days, it has been in the upper 80's low 90's, the gauge would go up to the top of the normal, fans would kick on and go back down. Now the accuracy of the factory temp gauge is another story on these cars.
1988 Turbo Coupe, Black/Black, 5 Speed, Moonroof, T3/T4, ported E6, 255LPH, Kirban, Stinger Exhaust, MGW shifter, K&N, Gillis valve, BP1.5, PIMPx, Koni's
1964 Ford Galaxie 500XL, 390 6V, Big Solid cam, Headers,3.89's, 4 Speed, Vast and fast
1960 Ford Starliner, 292 Y Block, 312 4bbl intake, headers, 3 Speed, slow and low