0.4mm thermal pads will be included in the next build of the case, which is happening now, I have 0.4 mm on their way to me and distributors to ship standalone as well. It's been in the works for a couple weeks now. You can use the case without a pad until they arrive, it's safe. modmypi has no authorization to say what is and what isn't compatible, he's not really an authorized distributor. (they don't communicate with me, they go through thepihut, and don't have an agreement with me,