If I remember right, I had one from that series. It was a Rolls Royce Phantom
You might do a search on e-bay.
You can search by manufacturer either by year of car, or year the kit was dated if supplied in the seller's description.
For example, to find by year of car, just type in Monogram 193*
and hit enter.
The wild card " * " will get all references from 1930 to 1939.
Works much the same if the seller included year the kit was dated in their description. Say the kits you are looking for were released in the '80s.
Just type Monogram 198* and hit enter.
Works pretty good. Hope this helps!!