reCap Mason jar cap bungs

I bought a couple reCap brand Mason jar lids for making sauerkraut in a properly anaerobic environment. I also bought a couple bungs and airlocks. Unfortunately, I bought all of these online, sight unseen, and no dimensions were given for any them. The airlocks fit the bungs, but the bungs are too large for the reCap lids. Does anybody have these lids and know what size bung I need?

And I will make beer too, I promise. A friend gave me a kit he had and never used.