Are you handguards getting ugly or worn out?  They can be reversed left to right to expose the undamaged side or wet-sanded with 400 to 600 grit sandpaper.  If you do need replacements, they are only $30 for a new pair.  Reuse your old hardware.
NOTE:  We custom manufacture the hardware for this application  There are no off-the-shelf products that can be substituted.