Is this factory carpet?

[DanMcG]

I've never seen carpet run up to the back window.
84 c10

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[dvdswan]

My 78 came with back wall carpet from the factory.

 

[DanMcG]

my 78 and 85 stops under the seat. Is it 2 piece?

 

[Craig 85]

LMC and other companies are now offering the back wall carpet.

http://www.lmctruck.com/icatalog/cc/full.aspx?Page=78

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[75gmck25]

My '75 with Silverado trim had something on the back wall (there are evenly spaced screw holes in the back wall), but I think it was a fiberboard tray on the floor with a long back piece that extended up. It was long gone when I got the truck.

Bruce