I did some more investigating and discovered that the button with the rounded center (top right in pic in first post) is listed as 54-55 by LMC, 55 by Classic parts.com and 54-55 1st by Classic Chev parts. The one with the shield shaped center (lower left in pic) is listed as 55-56 by LMC, 56 by Classic parts.com and 55 2nd-56 by Classic Chev parts. This is not ideal documentation, as I have no idea where these suppliers got thier information. It would seem that the rounded center is correct for 54-55, and the shield center for 55-56 with the 55 2nd possibly having either one? Maybe the Cameo is the key to this?
