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<font face="Comic Sans MS"><font size="2"><font color="navy">I would measure the fore triangle then measure the sail and compare the geometry. </font id="navy"></font id="size2"></font id="Comic Sans MS">
Hoist it up and see how it looks. The J on the C25 is a bit longer, so it won't be a 135 on the C250; more like 140-145. Measure the LP on the sail and do the math.
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.