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one key for ignition, doors, hood,glove box, tailgate and spare tire lock. Right out of a sealed ford bag D9tz-xxxxxx 1979 only but fits all years.
RH keyway square head key.
one key for ignition, doors, hood, glove box, tailgate* and spare tire lock. Right out of a sealed ford bag D9TZ-1022050-E 1979 only but fits all years.
RH keyway square head key.
1979 F100/350:
D9TZ-1022050-A .. Door/Ignition Cylinder Lock Set / Obsolete
I know that less than ten years later when Ford was making the SSP police package Fox Mustangs, that they were delivered with a single square key for the ignition, doors, and trunk. I'm not sure if they had locking glove-boxes. Obviously they used the later ignition switch/tumbler, and the glove-box lock is different, but it's possible that such an option existed earlier to accommodate the '60s style ignition and glove-box locks used in Dents.
All in one factory sealed Ford kit except for the switch and handle which I have assembled. (Bronco):
All these locks except for the spare tire lock can be re-pinned to match your existing locks. The glove lock uses three of the five pins and take the same pins. Hood release uses four wafers and can be re-done to match if yours does not. Bronco tailgate uses same pins again.
This set may be the last NOS set that existed. But like I said, you can make your own keyed alike set wits some spare-parts-locks and a few hours. I already have another set that I matched for another bronco.
The tool box lock is a different key and any locksmith will be able to make you a key for one. Some are disassembleable, some are not. Some have a "keyway door" some do not.
'Way back when, as an anti-theft measure manufacturers started using different keys for ignition and locks - the theory being that if had one key for doors and ignition and a different key for gloveboxes, consoles, and trunks, you could leave valuables in those storage spaces inaccessible to the mechanic or valet who had the key. So over the years you will find one key fits all, one key fits ignition but not trunk, etc. Over time variations appeared like valet keys which would start the car but not open storage, and so on. Different years, and sometimes mid-year cut-ins, could mean you would have two, or if you had added things like toolboxes, three keys. In the zillion years since then many folks have converted multiple locks to use fewer keys for convenience so one key fitting four locks is very possible. Lecture over.
Note I did not say "Ford" - GM started the two keys system in the '60s, I believe (certainly by my '64 Tempest). Most imports did single unlock-everything keys until someone started the valet-key thing in the '80s. Think Ford started it in the '80s, like you said - my '78 has one key but our '95 on had two (I passed on Fords for several decades o I am a little weak on specifics.)
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and spare tire lock. Right out of a sealed ford bag 
