Well, after searching for the Beseler Dual Dichro S head's "Hex Cell Diffuser" and not finding one (except for the non-S model's) I've decided to see if I can fabricate the box that houses the aluminum honeycomb (the "hex cell" part of the the name.)
The non-S model's might or might not be smaller than the S model's because the hole that the light comes through for the non-S is smaller than the S model.
So what I'm wondering is if someone has the Dual Dichro S head would be kind enough to remove their Hex cell diffuser and take some clear pictures of it sitting next to or on a scale or ruler?
If anyone could that would be great.
This is the wrong one but it gives you the idea of what I'm looking for:
After getting the manual for the S model it appears that they are the same size excet the S version has tabs that make contact with the circuit board underneath and cause the indicator light to go on.
Just in case anyone has one that they'd like to part with cheaply, here is a picture of the thing. It's the same except it's got the little tabs extending to close the circuit that lights the "diffuser" indicator light on the front.