1964-72 GM 442, GTO, GS Frame To transmission Cross Member Mount Bolt, Nut,and Washer Set 12pc These are the bolts that hold the transmission cross member to the sides of the frame rail. They are grade 5 and they have the head marking TR with the three dashes. They are plated black oxide. Also included are the correct silver plated lock nuts and the thick washers. These are often missing and impossible to find. These are factory correct and exact to original.