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If it was the factory key, the dealership told me that thay have no record of the keys, and can't duplicate the key. If it was a GM replacement, they all look similar and symetrical. So, any one should fit. To get the old one off, the best thing I found was a socket from Snap On that removed them. Snap On was real expensive and I have since seen them at Sears for considerably less.
After changing mine with the GM replacement, I can't under stand why I needed a lock at all. I should have just got regular lug nuts. If someone steals anything, it will be the whole car.
Sorry, didn't know Gorilla was a brand name. I assumed you were looking for a very large mammal to get the locks off with no key. Like happened to me. Never mind.
Again, good luck.
Your Gorilla nuts should have come with a sticker that says:
WHEEL LOCK KEY
REPLACEMENT INFORMATION
In order to replace a lost key or purchase an additional key, send your name, address, and wheel lock key registration number along with $8.50 to:
Gorilla Automotive Products
P.O. Box 58747
Los Angeles, CA 90058-0747
The registration number is at the bottom of this sticker.
Since you don't have the sticker, you'll probably just have to hammer a socket on to get them off, or you can find contact info for Gorilla at: www.gorilla-auto.com . I'm sure this is a common problem, I don't know how they handle it.