Stainless Steel 3/8"-16 nut and SS external lock washer for mounting Z-bar

This is for mounting the Z-bar on most 60s and 70s GM Muscle Cars. Some Impalas used a 3/8"-24 fine nut but most GM cars used the coarse nut. Included are a 3/8"-16 stainless nut and stainless external lock washer.