Product review (5 stars): Looking for a 990-30 with metal frame?  This is it!
After ordering from another seller who claimed that the metal frame was included in their humidifier pad (surprise, it wasn't!), I decided to pull the trigger on this 2-pack and hope for the best.  It arrived quickly (thank you, Prime!) and was exactly what I was hoping for.  I installed one of them a bit ago and it fit, as expected, like a champ.  Will set the second one aside for when I replace it again in 6mo.

Folks, if you're looking for a 990-13 (I couldn't find this locally!) two-pack to appear on your doorstep, this is the one to get.. especially if yours requires the metal frame!