Looks to me like some aftermarket farmer style repairs going on to reinforce headliners to keep the sagging to a minimum.
Those brass buttons and braces do not look like a factory item.
K10 looks like you better get your wallet out....
~ Phillip
1949 GMC Suburban - 10 year project
1952 Pontiac Chieftain Convertible straight 8 hydramatic
1945 GMC half ton truck - Driver- Sold 9-15-25
1946 Chevy COE - SOLD 1-5-26 BUH BYE CHEVY!
1959 GMC Half ton long bed NAPCO
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