Competition Engineering Roll Bar Fill Plates are designed to fill roll bar tubing gaps around firewalls or rear parcel shelves. These slotted fill plates are also used to tie roll bar tubing into rockers and A/B pillars. Stamped from 18-gauge steel, these 5'' x 10'' roll bar fill plates are available in your choice of 1-5/8" or 1-3/4" diameters.