Longhorn Emblems

[LILREDGMC]

This is open for all but I expect Longhornmail to straighten it out. Was at a flea market and saw three NOS emblems, one with white paint in the recess of the letters, one with black paint, and one with none. Any ideas about what belongs on what with respect to years colors etc?? They had GM part numbers on the back, one had pins to bolt on, the other two, one with an adhesive tape, the other clean with no pins or tape. Any one have ideas or facts from sales brochures? Thanks