Well really you need 4 pieces. The outer and inner panels, the header panel sandwiched between the two and the drip rail.
Exactly But really even if you had just a new header panel it would make the job easier with a donor roof. When I did mine by the time I drilled out all the spot welds from the donor what I had left was basically four slices of swiss cheese. 
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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