Hi Nik,
A lot of this stuff is vendor specific thats why people like Precise Parts make a fortune from manufacturing adapters.
Its not only the diameter of the focuser one has to consider but also the thread pitch that they used.
e.g
Takahashi 2.7" Focuser 72mm x 1.0mm thread pitch
Vixen VC200L Focuser rear thread 60mm x 0.75mm
GSO 8" RC rear cell 90mm x 1.0mm
Meade SCT 3.25" 16TPI
Celestron SCT 3.3" 16TPI
So your question what fits a 3 inch focuser would depend on who made it and what thread size and pitch they used.
Cheers
Bill
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