I saw this add on CL for a 87' Cutlass which obviously it isn't but appears to be a 79' but also when I search 78' and 79' Cutlass some have grills that continue on top of the header panel, is one for a Supreme? I am not real familiar with the 78'-80' Cutlass.
https://detroit.craigslist.org/okl/cto/d/1987-cutlass-supreme/6570188397.html
Then there is this style
https://detroit.craigslist.org/okl/cto/d/1987-cutlass-supreme/6570188397.html
Then there is this style