These are flathead Ford type mounts and both CE and Speedway offer different length mount brackets that you can cut to size to fit your frame. They are a very clean set up that doesn't block pan access but if one is using a fire breathing torque monster then a tube that joins the frame rails together and has the mounts on it is a better choice. Any mount bracket that attaches to just one frame rail always has a twist on that rail from both weight and torque. Factory mounts are usually on or very near a crossmember. Fine for 90% of applications.

Evan