I recently acquired a couple of fairly decent originals. I know for sure they are not 54,55,56,57,or58.
1952 was the golden annirversay for Cadillac, and I think from that point and the rest of the 50's the bezels were gold. Both on the ones I have are chrome not gold.
There are two crests neither of them are flat so I don't think they are for the trunk. Both slightly are diffrent I'm thinking maybe a 50 and a 51. Do you know any of the measurements on the 50 or 51 hood crest or the placement of the screws on the back that might help me tell what they are?
I have the bezels and platic inserts.
Maybe I can help you out, if I know what I have.