XC/XR do not have helmet locks. It's not a big deal if you wear a 1/2 or 3/4 helmet simply put it (or them) in the saddle bags and lock the lid. There aren't a lot of options on where to put a lock if you have the forged bars. You can't use the easiest ones to find, they are usually made for tubular bars. Here's a few suggestions:
Change to Kuryakyn grips and get the grip end locks.
Fab a plate for a standard helmet lock -- install inside highway bars.
Buy the Victory Trunk and have instant room for 2 full helmets.
Fab a mount for bag protection bars.
Retired USAF, IYAAYAS!
2008 V-Star 1100 Custom Bobber project
2011 Crimson XR with Forged Highway Bars / Hard Bags / Passenger Backrest, Ness parts including Smooth Layback Plate Frame/Mount / Rad 3 Mirror / deep cut grips / drivers floorboards /shifter peg / brake peg / passenger pegs. Witchdoctor black rack, Lloydz filter / timing wheel / VFC III, 7Jurock windshield, Drag Specialties seat.