The gauge carrier of my '72 SS 454 El Camino is badly deteriorated and has some minor damage. I sent out feelers for a replacement on the parts wanted page. I have been offered several dashes in response to my inquiry. I have noticed some differences in the various offerings and don't know which would be appropriate for my restoration. The last one shown me had a chrome accented slot of some sort just below the radio opening. It was supposed to be for a '72, but mine doesn't have that. I assume that mine is original. How can I identify the correct one for my year/model?