Can't help you with a 9.25 but on the C-8 the radius blocks attach to 2 wide holes at the rear and a single hole in the front.
Any Losmandy 'D' Series dovetail will fit 'D' Series saddle plates by Losmandy, Cassady or BT Technologies. The 'D' series saddle's are now standard on all Losmandy mounts. If you are looking at an older GM-8, they came with the 'C' Series saddles, about an inch narrower.
Cheers
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