Lower Cat Rail Spreader BarTo keep your NRS Cat Cargo Floor taut, use the NRS Spreader Bar. They're designed to fit between the lower side rails on our 66"W and 72"W yoke style cataraft frames. Weight on the Cargo Floor causes the lower side rails to bow slightly and the floor to sag. The Spreader Bar prevents that bowing and helps keep the floor "trampoline tight". The Spreader Bar attaches to the lower side rails with included NRS Oversize U bolts. Length of the 66" model is