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From "Illustrated Facts and Features Manual" indicated dimentions listed below. Did not note 'stake bed' and or dimentions but fairly certain it was also offered. Perhaps more knowledgeable member can fill in, or correct. Believe there is also a 'Stake Bed' offered in 65 but not sure about other years and extremely rare. Appears dimensions for Styleside and Flareside are same, noted each invent of any variations.
Styleside:
F100 came in 6 1/2' and 8' bed. 115.0 Wheelbase and 78.7 inside floor length, and 8' bed dimensions are 129" wheelbase and 98.7 inside floor length.
F250 came in 8' bed.
F350 came in 9' bed.F350 styleside 9' bed dimensions are 132.0 wheelbase, and 108.1 inside floor length.
F100/F250 (4X4) came in 8' bed. (dimensions different than 4X2 dimentions)Best as can determine, F100/F250 4X4 only offered 8' bed and dimensions are 120.0" wheelbase, and 96.1" inside floor length.
Flareside:
F100 6 1/2' and 8'
F250 8'
F350 9'
Dimensions for 6 1/2 bed: 115.0" wheelbase and 77.9 inside floor length and the
8' bed dimensions are 129.0" wheelbase and 96.0 inside floor length. The dimensions on 9' bed is 132" wheelbase and 108.1 inside floor length.
To add to Dave's reply, the stake or also known as platform bed figures I got for 65 model are. F100's 6 1/2' bed, 80.0" inside bed length, tailgate opening 67.0"; as for 250's, 7 1/2' bed, 90.0" inside bed length, tailgate opening 73.7".