Here is a side-by side of the two Energy Suspension bushings. The 3-1111 is used on 93-02 Camaro/ Firedbird, and the 3-1112 is used on the 84-92s.
Torque arm bushings.jpg
You can see the differences in the sides as well as the protrusion. From these pictures, it appears that the 3-1112 might be the one to work, but you can't tell for sure.
From Clyde's post there is a photo showing the two types of bushings used. The parts on the right show the two piece bushing. You can see that the original bushing bolted to the mounting bracket. You can also see that the contour of the outside bracket (top bracket in the picture) and the position of the torque arm relative to the contour seem to match the 3-1112.
Torque arm bushing bracket.jpg
I sent an email to Energy Suspensions asking them what they know. Will post their reply.'
Without additional info, I won't be able to tell which one can be workable until I tear down the car, which won't be for a few weeks or longer.