General Motors printed out sets of postcards that dealerships would use for advertising, or send to prospective buyers as reminders of the cars they looked at or were interested in. These were done yearly and displayed pictures of every model and make in the GM lineup, the H-Body included. I have been able to collect every H-Body postcard that GM produced from 1975 through to the end of production in 1980.
CHEVROLET MONZA postcards
OLDSMOBILE STARFIRE postcards
PONTIAC SUNBIRD postcards
Topps H-BODY trading cards