Re: What ford OEM headunits will fit in the ranger?
Some FX4's and Level II's came standard with dual media CD/cassette HU's that will plug right in to your Edge. Late 90's/early 2000's Explorer dual media are little different but they should also be a direct swap. There are surely other Ford plug and play HU's but you'd need to check the plug receptacles on the back and the mounting method for compatibility.
2003 FX4 Level II, Supercharged 5.0L V8, Headers, Duals
BW4406 manual transfer case, Aussie Locker, Torsen L/S, 4.10's
Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, ABS switch, sway bar discos
Heated seats, Explorer EATC, Trip Computer and consoles
2003 XLT 2.3L M5OD-R1 reg cab beater, 2011 Taurus SEL, 2016 C-MAX Energi Plug-in Hybrid