Sounds like a 1970’s Monte Carlo/Malibu spec FW 15x7 Rally with 1978 production dates, which probably means over the counter replacement wheel since Monte Carlo/Malibu/ElCamino all downsized in ‘78. K-1-8 9 (valve stem) 13 translates K-Kelsey Hayes, 1-Chevrolet, 8- 1978 model year, 9 13- September 13.
$75-100 wheel I think if its nice-no rust in the seams, nice bolt holes
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