Whilst waiting for the list may I ask what medium is being used in the absence of the Ilford postcard paper. I've brought a pack of multigrade 5"x7", but it's very thin, and I wonder if it will survive the post. So, who's using what?
You should be able to order MGIV-RC 5x7 in Portfolio weight - this is the same weight as the now discontinued postcard paper. Or ring around the usual suspects: some supplier may have a box left over.