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I replaced all of my emblems with Gold Emblems. My rear facia is different than your because mine is a '90, I'm sure that they have gold decals for the recesed CORVETTE in your rear facia. IMHO the Gold contrasts well with the Polo Green Metallic. I have attached a couple pics.
My 94 polo green has the beige interior and I have the gold raised letters on the rear bumber slots. Is this what you are refering to when you say "the best decal colour for the back is to compliment this colour "?