All new hemis that have the 5 speed trans( car motors) behind them had the spacer. I use a carbid bit and grind a relief in the side of the spacer and then pop it out.
69 Barracuda
70 Cuda
70 Cuda
70 Cuda Conv.
70 T/A Challenger
70 Sport Fury GT
71 Demon 5.7 Hemi
72 Demon