4 BACK PLATE (3/16″ TUBES) 1/16″ X 1/2″ WITH 7/32″ MOUNTING HOLES) STRAP (FITS ALL) 3 BACK PLATE (1/4″ TUBE) 1/16″ X 1/2″ WITH 7/32″ MOUNTING HOLES) (FITS ALL) 2 BACK PLATE (3/8″ TUBE)1/16″ X 1/2″ WITH 7/32″ MOUNTING HOLES