Shaft Length indicated in Model Number.

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I need to replace a very corroded lower motor mount in a 2007 Evinrude E-Tec 250. The model number is E250DPXSUA. The parts diagram shows one part number for 20" shaft and another part number or 25" and 30" shaft. What shaft length is indicated by this model number?

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Model Number Reference

I found a publication that shows the letter "X" means 25" shaft.