I was in the lhs yesterday nosing around and didn't even think of looking for X20a since I don't use it as my Tamiya thinner anyway. What I do use from the Tamiya rack besides a few colors is Tamita X22a clear gloss and he runs out of that a lot. I'd like to get a larger bottle of that.
But what I did notice was many empty slots of Model Master enamel while the MM acryl rack was full. As was the regular Testors enamel rack. For what I had in mind the regular Testors will work. He might as well down size the MM enamel rack it's taking up valuable space.