Tips needed on buying and installing '71 Duster lower door hindge.

Dorman #38381 is the kit you need. Also sold as Motormite "HELP" brand at the stores. RestoRick sells complete door hinge repair kits (with springs): http://www.restorick.com/proddetail.asp?prod=DrHingeRebuildKit

The springs alone will show up on Ebay.