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The fixed pilot seat support measures 17 3/8 inches height from front base at floor cleat to seat bottom.
The base measures 14 5/8 inches front to back at floor cleat.
The seat width front to back measures 11 3/4 inches.
The height of the support at the back measures 28 3/4 inches.
The seat back angle cut is @105 degrees, and measures 11 3/4 inches from seat bottom to top.

Sorry, I do have measurements for the 3 L-brackets on the Eastport rear seat.