P-47D Bubbletop

I recently reread Roger Freeman's "Republic Thunderbolt". He notes that the Army's original plan was to produce the bubbletop as the
P-47L. One aircraft was completed with this designation. Then, it was decided to produce it as the P-47D-25. He gives no explanation for this change. Does anyone know why this happened?
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Mike wrote:

This may be of interest:
http://en.wikipedia.org/wiki/Republic_P-47_Thunderbolt#P-47D_.2F_P-47G_.2F_XP-47K_.2F_XP-47L
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