When I got a Yakima coffin it had the keys busted and one was stuck in the lock. etrailer.com is a great place to get parts for that kind of stuff. Their prices aren't bad either and staff can be helpful over the phone or email.
Its also where I buy my hitches most often, great how to videos for that stuff too.
Its also where I buy my hitches most often, great how to videos for that stuff too.