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This link lists every color that was used in 1993, No listing at all for QV4 ever! What does come up is PV4 and KV4 (same color). I suspect it was a typo or you read it wrong. First is the main body color then the second is the secondary color witch should be the PV4/KV4.
Yeah, this entire QV4 thing is a cluster. Very hard to find anyone who refers to it as QV4 but some have found it. It's out there and it exists. This body shop guy found it and said it's the same as PV4. I believe it! I checked my hood sticker (photo below) and build sheet and in both cases it refers to the secondary color as QV4 (my primary is PVB). Definitely sent me on a wild goose chase but I think I have it resolved...hopefully. Everyone recognizes PV4.