Trim Rings on Trans Am
The 15" Rally II was a special wheel and was created by welding another 1" ring around the a 14" wheel. Because of this the trim ring was not offerred, at least initially.
The build sheet above documents a Trans Am with trim rings listed as an option, indicating that larger trim rings may have been added at some time during production.
This wheel was also offerred on Catlina, Executive, and Bonneville in 1970.
A 15 inch diameter trim ring, Part No: 9796696, is listed in the 67-72 Parts Catalog as being available for 70 and 71 Pontiacs.