Oklahoma Joe's 1996978P04 18.5-inch Carbon Steel Deep Dish Pan, Black

Is the diameter of this pan measured from handle to handle or pan edge to pan edge? If its pan edge, is it top edge or bottom edge? Thanks!

can you use the griddle on the long horn joe's grill?

Will this fit a recteq bullseye or Webber 22.5?

Will this fit the Oklahoma joes dlx 900?