I purchased a letter "I" on ebay with excellent chrome. I was too lazy to measure my old letter on my 63 skylark because it looked so alike. I receive it and the mounting studs are 1/2 " seperation center to center. My "I" on the hood of the skylark are 5/8" separation center to center. Another thing i noticed is that it has no numbers or letters of identification like the OEM letter. Is this letter i got on ebay a reproduction or did the 64 or later years not have identifiable marks. Also, the studs have cast reinforcement, as if it was improved due to studs breaking off.