1982 Front Turn Signal Parklight Wiring Help

[epon]

I'm trying to pick up where PO quit and don't have front blinkers. Rears are going but the fronts, which I assume are in the park light housing in the bumper, are not there. The only wiring there are is for the side markers, low beam and high beam bulbs. I've confirmed low and high beams, side marker lights are all working and rear blinkers are working with all of those on.

Hoping someone can explain it like I'm 5 since I'm no copper thumb. I have 2 parklight bulbs and sockets on the way for the bumper housings and just need to know what color wires to tap in to. Worst case I suppose I could just tap the wires going to the rear blinkers before they leave the cab?

The parklight bulb in the bumper looks to be double filament, is there also a wire shared with the sidemarker lights?

Also hoping to confirm when the blinkers are on the only bulbs blinking is the one in the bumper?

TIA