I'm not sure about your Galaxie but my 65 Comet has two sizes. I took the trim to my local body shop paint supplier and they matched them up cost about $6 for a bag of each size
All the letter barrel clips for the letters on a 63 Galaxie are 1/8". The ones for the engine Birds on the front fenders and the chevrons on the rear fenders are bigger and are the same size.
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