I need a harmonic balancer for a 1975 plymouth duster slant six. anyone know where to get one?

advance can get you one on one day for that vehicle if you really need it bad enough,if your not in a hurry you can go through year one or paddock parts,they also have those,but advance has the best prices on those,i ordered one a few weeks ago for 129,95 new,one day service on it,make sure to take them the old part,so they can match the numbers up ,good luck.