Oxidonis, I might have a bit of a gold mine for you here. I've just compared our lists, and I've got duplicates of 87 cards you don't have, broken down as follows: 4x Audi, 15x Citroën, 2x Dodge, 16x Ford, 1x Lotus, 2x Mazda, 14x Mercedes, 2x Mitsubishi, 14x Nissan, 5x Renault, 4x Subaru, 6x Toyota and 2x VW.
I'll start off by offering the four Audi cards (#'s 44, 61, 74 & 78) plus the Lotus card (#16) in exchange for the Holden Commodore. If you're interested and then want to do some repeat business, let me know! I know you've got a few trades already lined up, but I can trade whenever you're ready.