Alot more info is needed. Like it was stated above the drive train is nothing special so I am guessing it is a base model and not a Rallye or SE. What is the color combo? Does it have a slap stick ? What axle (I am guessing 8 1/4) ? But above all Photo's are needed. To be honest you are on the wrong site to get good answers to your question. The alot of the guys here know just enough to give bad answers ( like the guy that swore you could get a Six-pack on a HEMI). You need to go to
www.moparts.com or
www.alpar.com . There is a site for older e-bodys but I can't remember if it is
www.cuda-challenger.com or
www.challenger-cuda.com