Okay, it should work, there is an anodised ring that holds each colour in place, it is a standard thread as it is the same as the thread on the filter wheel/eyepiece, so any low profile filters would work as a donor set I would think.
I'm sure there are plenty of old unused filters out there for donors, or you could get a cheap set from Andrews ($15 each, you'd need to check the height) or similar. I'll see if I have any old ones I don't want in the cupboard.
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