If it were me, the fronts, they'd be ditched immediately along with the wiring and controls. Assuming the forward harness isn't stock RPO specific. I'd leave it tucked away otherwise.
The trunk flashers are a neat RPO. The blues would go and be swapped for the OEM red ones. Unless the brackets, harness, and relay are not RPO specific.
Blue wasn't factory and neither were the specific plastic housings shown here. Only the black metal with the paper gasket and big metal snap ring retainer for the red plastic lenses.
BLUE IS ILLEGAL. Damn whackers