Replacement drums and hubs for 1969 Dart with 5x4.5 lugs?

as covered no BBP a-body drums, so you'll need to convert to discs.

your choices are: stock 73~76 upper control arm, spindle & related parts (master cyl and plumbing bits), or an upper ball joint adapter to reuse the small upper ball joint arm with the 73~76 spindle. on the lower control arm, you'll either need to change your lower ball joint because of the larger spindle bolts or drill out your existing lower ball joint to match. the lower control arm is the same across all generations of a-body, albeit with differences for swaybar tabs.

or, an aftermarket disc kit that reuses what you currently have and bolts onto the drum spindle. you'll still need the master and what not, but that all comes with the kit, or at least it should.