Oh, My...Looky Here:
HAZARD FLASHER - 1985 Ford E-350 Econoline (D1FZ13350A)
and
TURN SIGNAL FLASHER - 1985 Ford E-350 Econoline (C5AZ13350B)
These were on a Ford Dealer's parts website. BOTH discontinued. By Ford that is. The auto supply stores'll have them.
Here's AutozoneAnd it looks like Two-Terminal. This one flashes 1-10 Lamps.
And the Four-WayVerify any part numbers anybody sends you. What worries me is you say neither flasher system works. Maybe one fuse feeds both, maybe somebody discarded both flashers. Mystery brewing...