cannot find keys
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
I bought a 1979 F150 Lariat Super Cab brand new, it had SQUARE head door and ignition keys.
Cargo Master
Joined: Oct 2016
Posts: 2,738
Likes: 217
From: Northern VA
Is it not possible someone made spare keys in the 40 years since the car was bought? My 74 came with both square keys, but its easy a trip to the mom pop hardware store to pick up a round key. The lock doesn't know. 
Fleet Mechanic
Joined: Sep 2009
Posts: 1,404
Likes: 14
From: Bloomington, IN
My (2) 79 F350's have square key for the ignition and round key for glove box, doors, AND side tool storage box. Both keys have the Ford oval on them.
Fleet Mechanic
Joined: Sep 2009
Posts: 1,404
Likes: 14
From: Bloomington, IN
Of course! BUT the lock does know when the key won't work based on the key cut, regardless if its square or round!!
Cargo Master
Joined: Jul 2005
Posts: 2,313
Likes: 367
From: Kansas
if I remember correctly, the round key and square key are mirror images of each other so a round key can't be inserted in the ignition or door and the square key can't be inserted into the glove box.
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Grumpy goat
Joined: May 2017
Posts: 3,058
Likes: 596
Nope, they're mirrored. Round blank won't fit in ignition cylinder, an vice versa.
Logistics Pro
Joined: Oct 2006
Posts: 4,031
Likes: 891
From: East Central Ia
Seems like the round in the door became standard at Ford with the 80's, if you ordered a car you could order single key locking system and that would include hatch or trunk. Usually standard on police cars. Ford did have the better idea in the beginning. Door and ignition on 1 key. 2 keys was sign of GM, get one key out then fumble in the dark for another to start. Ford key was like modern valet key you could keep things locked in trunk or glove compartment and someone could still move your car.
Laughing Gas
Joined: Jan 2018
Posts: 898
Likes: 70
From: Coos Bay
My 79 F350 set up the same way. My 76 swb was also. All the others i had were square for everything except glove box
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