When I was about 17 years old, a friend and I were replacing the clutch on my old dodge and used a socket extension for an alignment tool We used electrical tape wrapped around the extension to get a fit. It wasn't high tech but it did work.
Anything will work as long as it fits in the pilot bushing and inside the disc splines and gets them reasonably concentric. Even the plastic ones can be a little off. Depressing the clutch as you insert the tranny can help it slide home into the pilot bushing if there's a little misalignment.
