I bought two sets. One set looks like the ones in the picture. The other set was a little smaller. The set that looks like the picture (grey); on fit, the other didn't. Probably the keg lid was different in some way. The clear/white plastic worked fine.
It fit all my Cornies except for one. It was a little big for one of the lids. To remedy this, I used a little silicone sealer to secure them in place.