Gentlemen,
The newer style HD grab rail fits 2015-2016 CVO Road Glides, I have installed a chrome version on a friends 15 FLTRUSE and I installed the black version on my 16, What I did find is the cut out in the seat pan in the OEM seats does not align with the grab rail arms where welded to the mounting bracket, you can install the OEM seat without modification but you have to apply alot of force to the push the back of the seat down and to the rear to get the seat tab over the threaded stud to fasten the seat to the fender, but in a short time period the rivit that attaches the chome tab to the plastic seat pan will pull out and detach from the seat pan (don't ask me how I know - but I dd get a new seat under warranty)
The easy fix I did to modify the pan for the proper fit was to remove the existing 1/4" staples 4-5 per side hat hold the seat cover to the pan in the
area of the notch that is susposed to clear the grab rail/mounting bracket, pull the cover out of the way and I used a dremel tool with a sprial carving bit to cut and extend the notch forward about 3/4", vacumed out all the cuttings and reattached the cover with new staples utilizing a hand stapler.
Reinstalled seat and it now attaches to the fender like the rail was never installed.