The only one's I've heard of are the Reefdreams Baffle Kits, but they're located in the UK so depending on your location that may or may not help you.
What is your primary use of the fuge?
Myself, along with many others, have turned the ATO container that comes with the Reefer into a fuge. But this really only acts as a copepod breeding area, not very useful for nutrient export as it's so small. You would of course need to get a different ATO container, but I would recommend that anyways, IME, the provided one is too small.
If you do want it for nutrient export, I would recommend getting a new sump or a baffle kit. Maybe someone with experience with the baffle kits can help you more with those.