plymouth letters

The 66 hood letters "M" and "O" of Plymouth for the Valiant & Barracuda look like the 64 & 65 letters but are different, probably because of the center crease in the hood. I think the back side is contoured differently and the mounting pins are in different locations. The letters are chrome with the center painted a sorta flat black. I think someone has repro's of these but the M & O might not fit the 66 hood.