I have a 2002 F150 XLT with power windows and locks, but does not have remote key fobs. I checked in the door panels and no wiring for it. But I did find a white box under the dash above the emergency brake that has 5 numbers on it along with part numbers 1L3T-15K6020AE. It says remote keyless, ant, theft. Can I use this box and purchase the wiring harness, key fob and lock actuator for both doors? Or should I go with an after market complete outfit for around 80.00 dollars?