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I actually think it depends on what part of the U.S. or Canada you are from. I have always put the performance RPO in front the appearance RPO. Here is E. Washington, I have never heard of an RS/SS for sale, just an SS/RS. Same goes for a Z/RS. However, when it comes to a COPO with the RS RPO, I use RS/COPO.
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There you go, RS/COPO so it should also be RS/SS and RS/Z28. I prefer the RS listed first since it's a lower order option compared to the performance option. But what about the 96 Camaro Z28/SS? Or was that an SS/Z28? It was a 1 year only listing and kind of ruins the argument of the performance option being listed first or second. It really does come down to personal preference and that's probably why so many people jumped in on this post.