I was thinking that this goes over a ear on the transmission, drivers side. Something to do with one of the linkages. Is your car a floor shift? I was thinking it was to keep the linkage from moving around and rubbing on the aluminum housing.
Nah, there's an ear under the trans that a bracket bolts to. That's what keeps the torque shaft straight. It may not even be for the car? I bought it as a basket case and had LOTS of extra stuff. Very confusing for my first (and probably last) project!