1974 Duster wiper under dash linkage help.

14 years ago I "Mickey Moused" the under dash linkage for my wipers ... using local hardware store hardware, etc. Anyway, its clunky, jerky, unsmooth, too tight ... all of the above. I've had it and I'm ready to make it right. Anybody got a lead on a "official" hardware kit, a diagram, anything that could make this a painless as possible would be greatly appreciated. Thanks alot !!!