I e-mailed Griffin with this question and have pasted their answer below. As I thought, there is a slight size difference and they will be offering the correct sized clip. I will still try to modify the clip I have now.
Hello,
It is just a matter of using a new clip. We hope to receive them in the next week or so, but do not have a definite date yet. As soon as we receive them, they will be available on our website.
Regards,
JR
Griffin Technology
Support Technician