Trans problems?
Depending what size converter bolts you have the easiest solution, and possibly could be done in the car - would be to CAREFULLY drill out and tap the mount lugs on the converter to the next size (Hemis used larger converter bolts). You may need to also drill the holes in the flexplate larger to match. Use a small dab of loctite on the bolts when you re install them. You didnt break the diferential did you?