There are two of these bolts on hydrolastic front subframe towers to fix in place to the bulkhead. This bolt also holds the lower radiator bracket to the alloy casting on the gearbox when a 2 piece cowling pre 1974 is used. 5/16" unf bolt 4 3/8" long. If you are using these in the hydro subframe you MUST shorten them by about 5-10mm otherwise they will hit the displacers.