Lowen makes a kit. It works okay, but it broke the adjustment handle for the shoe sieve on our 2388. I don't know if that's common or not, but it's going to be a pain to fix.
I'm sure there are a few companies that make these kits, I just don't know who they are. You could always go with the kit from Case. They seem to work well.
If you are interested I have a set of external sieve adjusters I would sell. Went with the gordon Air chaffer and do not need them any more, just like new works fine. Pm me if so.
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