Jim:
It seems like this question has come up several times here in CC. The "answer" always boils down to what Skippy aka JYD said just above. You could spend some time doing a 'search' in here; but you'll find the same 'answers.'
One thing he didn't say (he's so PC, you know) is there is another vendor whose color seems to be a bit "off" the mark. (Now that's pretty PC also, isn't it??)
Understandable you'd like to mix your own; but the paint from The Filling Station - or - Chev's of the 40's is pretty reasonable. Anyway, stick with either of them on this paint color question and you'll be just fine. Just type either name in your 'google search thing' and you'll find 'em both!
:)

:)