The internal dia for the Titan is 6.5". The mount will slot straight in. You can "oversize" the external dia - mine is 8" to match the external pier dia. Just use longer bolts to fasten the mount to the internal sleeve.
Its the same dimensions as the Losmandy HGM200 pier head. I've got a diagram courtesy of Mr. Ward. He may chime-in...otherwise I can scan it sometime, but it wont be for a while.
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