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I have an NOS Cutlass front bumper impact strip with the white stripe, It is group 7.831 and is GM # 560310.
According to the Parts and Illustration catalog, it fits the following apps:
1978 Cutlass Salon Brougham
1978 Cutlass Supreme
1978 Cutlass Supreme Brougham
1978 Cutlass Calais
and 1979 Cutlass Salon Brougham
Asking $150 plus shipping
More pictures are available if needed.