Your chuck key probably isnt anything weird, I've seen at least 2 sizes of chuck keys there and one of them will almost certainly work for you.
The best thing to do is take your drill to match it up for proper fit especially if you are not sure of the size give them a call and ask.
Very possible. They have a large selection of drill chuck keys. Take the drill there.
They probably do they have all kinds of tools and stuff you would have to call them or go up there you would be amazed at what they have.
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