Unfortunately we at Fuego Living were not the manufacturer of this particular product so we offer no support, parts or accessories for this grill. It was made by Fuego North America, whom stopped producing and selling grills back in 2012.
I just found out from my boss they had 4 Square models. I was under the impression they had a circular one like ours. If it was the circular model. I understand that ours is compatible. Yes that is what would be known as the diffuser panel
They did have a third party warehouse who may still have some parts and accessories available. Please contact them direct:
Sorry we could not be more helpful on this matter.