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As you rightly say, the single-fin artist's concept pre-dates the built NA-98X itself and is described by Norm Avery as "B-25H based". Neither Avery's book nor the NA- designations index in Kevin Thompson's Volume 2 mentions an "NA-108X". If such a designation ever existed, maybe NAA considered at some point to create the Strafer prototype by modifying a B-25J (NA-108) instead of a B-25H (NA-98)?
