I tried to find them, too. Finally went to mySupport, in their normal oh-so-helpful way they claimed to be sending some out. What I received were 6x12 sticky vinyl pouches. I can’t use them but HR loved them and asked me to order more.
We put a Velcro comand strip on both sides of the sign clip, it’s hard to see and holds it snug to the cross bar so the signs don’t lean over. I’m not sure who’s idea it was but it came to me via email.