I had an '84 f250, and an '88 f150, and they were the same as my '89 fsb.
Round head key for door, glove box, square head key for ignition. In fact, I had a take apart key ring (I still use one now), and had the f250 door key on the opposite side of the ring. It had a diesel engine, and sometimes I would let it idle if going in somewhere just for a few minutes. I'd seperate the key ring, and lock the door, so no one could just hop in and drive off.
I'm rather surprised this debate is even happening, with the amount of fsbs some of you guys here have, or have had, spanning the generations. It's pretty clear that with the last original generation starting in '92, they changed the key setup, for whatever reason.