Looking for a knob that fits the Fire Magic Regal II. The knob on the website doesn't look like the internal hole has a half shelf to hold onto the peg on BBQ. Will it fit and stay on?

This one has a flat side at the 6 o'clock position. Since we do not list this knob to fit a Regal II, I'd compare the diameter of your valve stem and the position of the "D" in the off position to see if this will work for you. If you have any questions, please give us a call.