Thank you for 94 vert showing the differences. With me owning an STE and a Cutlass Supreme coupe, I know there are differences between those for the obvious reasons. When I had my 93 GTP parts car, I just remember that the header panel was a lot different compared to my 91 Cutlass coupe. Just guessing here but I'm assuming the rad supports are all the same between W body's...it's the header panels that are unique between let's say a Regal or Prix, etc.
55...maybe I have the terminology mixed up? For me, the header panel is the plastic or whatever material it is that mounts the grills, headlamps, turn signals, etc TO the radiator support.