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On my C-22, they are 1/4". Could be the same on the C-25. Length would be 2", maybe 2 1/2". Per CD, the fasteners for C-22 and C-25 standard rudders are 1/4" dia. Doesn't say how long.
I believe they are 1/4-20 X 2 1/2". But might get away with 2". I just replaced one last week - I will double check the size when I get home after work.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.