One other weichle that is made by GM is the GMC truck.
Often powerplanted with a Pontiac engine.
Here is the 58 Fleetline witch is my favorite.
In the back grond you can se a 58 pontiac. A 4dr sedan ChiefTain or SuperChief.
Here is a bunch of proposed advertisings that you could chose from.
You probably just chose one or a couple and send in your material
to the advertising company then they fix it with the newspaper.
Very cool advertising from 1958.