MadDart's 4-Link Rearend

Just a quick google search gave these options:

QA1 R101-200: Mopar Rear 6-Link Suspension Conversion 1967-79 Mopar A-Body with 8-3/4" Rear Axle | JEGS

4-Link MOPAR Coil-Over Rear Suspension Systems | Control Freak Suspensions

Prolink Rear Suspension for A, B, C, and E-Body Mopars

Mopar Pro Shop - Mopar Performance Parts (MoPowered) - CFS 4LINK KIT