I know this isn't the reply that you want to hear, but thought I'd throw an option out there for you. I'm looking for the same keys myself and this thread turned up in a forum search.
I reached out to Signature Plastics a few weeks ago to ask about availability of these keys since they are selling DSA Granite sets on their site and they said that it would have to be a custom order since "this original artwork doesn’t exist in our system anymore". They gave me a price of $40 for the custom order "on top of the key price" (which is $5 per key on the website). It was too steep for me so I declined, but if you're still looking it might not be for you.