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You may be out of luck. The stealership may be the only place. They are very hard to come by at a reasonable price, even for the F150. Sorry, dude. - Og
I got lucky. I have the 14mm studs on my screw. I found them at pep boys for 36 bux. It was 16 lugs, 4 locking lugs, lock key, and 4 valve stems with chrome caps. This may or may not help you.