IIRC the GTX wheel lip moldings are just Plymouth B Body moldings which are trimmed to end where the belt line moldings begin. If you had your old ones and have a steady hand you could get some regular B body ones and trim them.
And that repop GTX trunk finish panel or repop tail lite bezels are worth every penny. I went thru hell trying to get some originals replated by a pot metal plater - my finish panel ending up getting eaten in their acid tank and destroyed. If you can spring for the repops do it.