I buy my paint for these type of projects from Paint Scratch.com
http://www.paintscratch.com/ Make sure you mark the option for "Flex" additive for your color coat and clear because the lip is a urethane product and is a little flexible. I have the Paint Scratch.com paint products to repaint my side skirts and mirrors. The color match is perfect (you need to know your code) and it is very durable. Just remember that non-calatlized urethane paint takes about a week to fully cure. So don't slap it back on the car too soon or the bugs and chips will ruin it.
Cheers!
Mike R