Majority of shops here take the Gas cap, it doesn't matter plastic or metal as all they need is to adjust the stock code to the colour which is out there in the sun and other harsh weather condition. All gas caps on the car usually blend nicely with the rest of the car and easiest to carry to a paint shop.
Some of the colours are two stage like white and yellow from 370z for which matching is in hands of painter rather then paint as its all in the application. We painted one yellow Z and paint was off by 20% but paint shop said just wait for few days and after a while it matched perfectly no idea how.
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