the closest Chrysler part # to the 3402991 forging number is 3402612/613 which was a new "one-year-only" part number(s) for '72 C-body lower ball joint(s)

looks like it would fit 1965-'73 (non-4-piston disc brake) C-bodies here's what the aftermarket/reproduction C-body ball joints look like someone should be able to confirm with the distance between the 2 mounting holes