I've got them in 9x12 and 13x18cm, as well as 4x5". They're known as "Linhof Universal Film- und Plattenkassette mit Auswerfer". I haven't seen a 5x7" one, but a 5x7" plate can be used in a 13x18cm holder.

An older version is an adapter allowing single-plate metal hoders to be used in "modern" backs. I've got a 9x12cm to 4x5", a 10x15cm to 5x7", and a 13x18cm to 5x7" adapter (all with matching plate holders).