15x6.5 trim rings here. I had to cut back with dremel! Free hand and 2nd set of hands. Took long deep breath and went to town. Came out good. Bought mine from mopar performance many moons ago. That was only alternative I could find.
I would like to see pictures if you have them, I think with masking off and marking the inside of ring, I cut use the guide on my Dremel with a cutoff wheel to remove the approx 1/2 of material then finish the edge with some fine>ultra fine emery cloth.
Still I haven't seen anyone offering the brushed stainless style rings for the 6.5" wide wheel and my 8" in the rear.