Get yourself a marker light assembly from NAPA.
Cut the tie bar, bend a section back, and crimp a slot connector on a wire, slide it on and drill another hole out back for the extra circuit.
Cut 2 sheetmetal plates, about 5.5" x 3.25", align them in the signal light grille brackets and drill mounting holes where the old turn signal posts went thru, use sheetmetal screws to attach.
Place your cheapo light assembly, mark mounting (and ground) holes and drill, route your wires out the bottom, use longer sheetmetal screws to attach the light to the plate.
Terminate your wiring as desired, I chose the outer lights for turns and the inners for park, snap the lenses on, and test it out.