I do have the 2 tone interior, untouched that I can tell, and completely original inside the cab. The residue in the metal channels that I scraped out was black - no hint of blue that I could find. Do you think they even made a blue "rubber" in 1954? I have my doubts and would bet that the original was black. All the window weatherstripping is black.

Bob

1954 Chevy 3100 5-Window
1954 5-Window COE aka "THE BEAST"
Bill Ritchie's Original Truck

Granddad's Hardware Store: Ritchie Hardware, Concord, N.C.
Bethesda, MD