CALNNC,
Greenberg doesn't always list breakouts for items that are originally sold in a set.
The reissues of these cars, the cars listed by @bmoran4 above, came in a set with product number 6-31778. This is listed in the Greenberg guides.
BTW -- To find these together with their set number, but without prices, go to this link:
Thanks to @Larry Neal for the list.
Mike