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The special adapter is a larger diameter to prevent vignetting on FF SLR's
FWIW the orion adapter only screws on to the end of the original Synta focusser, it won't fit the GSO 10:1 replacement (not sure about the WO aftermarket focusser).
I'm trying to find a workaround as I've bought the Orion FR only to find that it won't fit my aftermarket focusser. It may just be a matter of finding an appropriate adapter, that is if the larger thread is a standard size.
Unfortunately I sold my original Synta focusser some tima ago, it would come in very handy at the moment.
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