I hope you find your New Haven set. Good luck!
If worse comes to worse (and that can't be all that bad) you can always get an undecorated set and do a custom paint job on them. It's not a hard scheme to duplicate. Even the lettering isn't hard. I've done it. A few minutes with an ink jet printer and some finessing Times New Roman font, and you'll have a good representation of the lettering on the cars.
I repainted a junk box set of Gilbert cars in this way to get a Bankers set that I never got as a kid, and can't afford as an adult... The little logos above the trucks were also done on my computer.