HELP what color is the 19# injector tube for C&L 73mm?

No that is wrong. C&L used the FMS injector colors for to indicate which tube. The blue tube is for the 24#'s, FMS 24's are blue, yours should be yellow/orange/amber like color, like the 19's are.

Sorry to hear they f'd up, I hate it so bad when these companies do this, I've had that so many times, that is why I don't deal with Mustangs Unlimited much anymore.