I changed the glove box in my GP yesterday and was going to change the lock but I thought why not try my key on the "new" lock and it worked. Was that a fluke or do all door keys work in any glove box lock...
Key blanks (specifically the slot in them) changed each year. If you look at original GM keys, there is a small letter on it which tells you which style it is.
I had a chat with an old-timer locksmith a few months back when I was fixing the locks on the coupe. He said (if I recall correctly) that they repeated every 4 years. My coupe had 1 door key (which actually would only operate 1 door lock), and 3 decklid keys (decklid swap)...I pulled all the locks out of a donor car sedan thinking I'd change them, but the coupe and sedan door lock cylinders have different shafts where the lever goes on. Long story short, he custom -milled some keys to work with my combination of 81 and 82 cylinders.
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