Most HP muscle cars did have them on one bushing per side. In fact, American Muscle does indeed repop them. American Muscle also sells the tool to reinstall them...

'70 Super Bee 440 6 pack 4-spd 4.10 Dana N96 EB5
‘70 Super Bee 440 6 pack 4-spd 3.54 Dana FC7
‘70 ‘Cuda 440+6bbl 4-spd 3.54 Dana N96 EB5 V1W