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There may be a sticker on the driver's side door hinge post (assuming it's still readable). Ford did that on SuperDuty trucks anyway.

Based on the DPC-203 on your circuit board, your choices are SOD1-SOD3, SOD5, and ALF5.
The tuner probably only needs the DPC-3, which is the hardware code for the PCM, and the fact that it's a manual tranny. Give them the whole part number, 5FT5-14A608-EC and they may be able to figure it out from there.
Here is the old PCM code listing.
 
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