crucibles and lids

HI may be obvious, but going to ask anyway!
If I order 30mm stainless steel crucible, should I order the same diameter lid or the 35mm?
Having not ordered these before (only ceramic which don't fit) I'm unsure.
Ours are 40mm the lid measures 55mm with a 40mm indentation in it to fit the 40mm crucible.

I have had to put a right angled bend in the teardrop shaped lid to make it easier to use the tongs.

These come with the lid. We use these and they do the job great.
Remember to take the plastic coating off the lid its nearly invisible and hard to see but it needs removing before use.