Original Piper L-4B seat cover

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Could anyone give me any ways or details on how the front and rear seats of Piper L-4B were covered during the WW2?
I found originals pictures (see below) from the LIFE magazine, that show leather or imitation style covers, but
I'm not sure ??
Was there any covering of these L-4B seats, in military thick canvas like the US tents canvas ?

Thanks for your help

 

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