Name of part?

[Diesel noob]

I am looking for the extra piece that goes behind the cab and over the bed. I have no clue what the name of it is or how to find it. Any halp would be appreciated

 

[79jasper]

Bed cover, camper shell, tonneau cover, etc.

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[Diesel noob]

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It’s whatever is on this

 

[79jasper]

Oh.... I forget the name of that one.
One guy was selling the body kit with all those pieces, but that's been years ago. Was a red dually.

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[Clb]

Targa??
Like a bimmini?
Phawkin nice limmo there bud (standing at gas station)