I have seen exactly one type of diesel badge on a GMC and it was a "Toro Flow Diesel" badge with the V like standard 305 trucks would have. Did they ever use a different badge for the detroit diesel trucks?
I'm just gathering ideas on my truck which is getting a diesel swap but I kinda like the badges on hood but want them to be appropriate for the truck so V8 diesel but I would just settle for it saying Diesel inside the round area of at the top of the V