28in driver side cv axle but only can purchase 25in replacement. Which is right?

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28in driver sider cv axle is clicking and needs replaced. Parts stores and dealers say 25in is the correct one. What would explain a 28in being used? The center part of the axle is even longer than the replacement 25in. Should I use 25in? What are some reasons if any for the use of 28in and where would I find a 28in? I have searched for cv axle and the longest I have found was 26in compressed.