You're best bet, probably, is to try Wheel Vintiques' trim rings:

https://www.wheelvintiques.com/accessories/trim-rings.html

Instead of buying 15x6 wheels, go with the 15x7 wheels and Wheel Vintiques' 15x7 Chrysler style trim rings:

https://www.wheelvintiques.com/accessories/trim-rings/15x7-chrysler-style-trim-ring-polished.html

Are the trim rings identical to Chrysler's? No, but comparing $48.40 each to $200+ each for NOS...

Mike.