Question about 1966 Vin code identification

[Metalaroundstone]

I have a 1966 Fleetside, but the Vin code number does not seem to indicate the Fleetside pickup according to the Vin code identification guide in the Factory Assembly Manual.
My vin code is C1546S198235, but the "4" in the vin code indicates a step side pickup according to the vin identification shown below.

I was looking at the thread on finding the first and last 66 trucks, and all the Fleetsides I looked at (I did not look at all of them) had a "4" (for a step side pickup) rather than the "34" (for a Fleetside pickup) according to the chart. What am I missing?