Boynton,
I found a set of 1/4-20 bolts that will work, but I think you'll still need the installation kit from Grant
Amazon.com: Grant 3196 Installation Kit:...
Which comes with the bolts. Let me know if you want them anyway.
Can you give me until next week to get a shipping estimate? With the holiday, I'm not sure if I'll get to the UPS store this week
-Jamie