So eBays a good judging ground huh?

[Steve Shauger]

You need to be careful as to what is presently produced and what is truly NOS. I believe the center caps you are referring to are used on the 70 Z28 and have the raised bowtie symbol, versus the later produced which are flat with the bowtie. Every situation requires intimate knowledge to get the factory correct part. Just because GM presently produces it under the same part# doesn't mean it is identical to what was produced back in the day.