At last a full size, comfortable chopper style backrest.
 
This full size backrest is designed to mate up perfectly with our sissybars and others per the size listed. Hardware is included and there is also an internal metal plate for sturdiness.  
 
The clamps are designed to fit around bars 1/2-3/4" in diameter.   The backrest itself is 14.5" tall by 6.5" width.  If you are not purchasing for a Combustion Industries bar; make sure to review dimensions to ensure compatibility.
 
Mounting instructions here.