9715291 is the casting number of the chrome portion, so every window crank has this number on the chrome portion. The actual part number for a black knob window crank is 7752485. Assembly line correct knobs will have three large steps in the side of the knob. These are single year usage, however black is one of the easier colors to find, and the same knob was used on Buick Olds and Pontiac.
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Steve
68 SS427 Custom Coupe 427/385/M21/3:73
68 Impala Custom Coupe 427/425/M21/3:73
68 Biscayne 2 Door 250/3 speed
68 Caprice Estate
68 Camaro SS396 4 speed
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