1990boostang

I just came acrossed a 99 Mustang that was a really good deal so I bought it. I have always been into fox bodies but the 4.6 is all new to me.. Anyways that is why I am here cause I need some info. Here is everything I know about the car and I will list what I am trying to do.. It started out as 99 Mustang Gt automatic. I purchased a crashed 04 Cobra for some parts. I have fitted the 99 with the cobra suspension, brakes, decklid, and rear bumper. I also have the driveshaft. I have put in the pedal assembly to convert it to a 5 speed but anyways I am needing to know what ecu I need to convert it to a 5 speed. It has power windows, locks, and no cruise. Really I just need to what numbers on the ecu and the rest I can handle. I really appreciate any help...