Did you find something that works? In the mean time, it looks as if you could use 1" nylon cargo straps and thread the loose end beneath the existing roof mounts for light duty work (canoe). Stainless eyenuts or eye bolts may do the job too if the short tax holes aren't the correct on centre spacing to align with the NV. http://www.mcmaster.com/#general-purpose-eyebolts/=nao3ry