Need good sources of new or used trim rings for '71 Twister

My Duster will soon be coming home after 4 months of body restoration and painting. Chose the Redline Pear Coat used on new Challengers.

I have the original Rallye rims that came from the factory with the Goodyear E70x14 Polyglass tires. How do I specify the trim ring size when buying? How much does quality vary between sources? What do I need to get to avoid buying junk?

Thanks in advance,
Ken