WTB: War machine wheel

I am going crazy here. I am quite sure I still have every bit I ever had, and I was convinced I should have a couple of the old plastic wheels for war machines. Am I crazy or did war machines used to come with a choice of wheels? There were the closed ones, the ones with those metal protrusions and more or less plain ones. So I should have ten pairs of wheels somewhere. But I don’t. I cannot find them.
Then I remembered that I took the wheels off my Anvil of Doom, but when I looked, I could only find three.
Long story short, is anybody here who has a single wheel of this type and wants to part with it?