There’s also these plastic receptXtenders. They are UL listed and come in both one and two gang with a different color for each depth size. Since these mount on the outside of the box, instead of inside like the Arlington’s do, it seems like they should work better with the plaster rings. Supposedly these are available at HD, but you can also order direct from the manufacturer. I think these may be what Mike was referring to in his post earlier.

receptXtenders