Plastic blinker assembly question

I got new blinker/ hazard light plastic piece that goes behind steering wheel for my 73 duster and it has extra 3 wires .purple.green with black stripe .brown with white stripe..and those 3wirea have a separate plug and is attached to blinker part of assembly..is this extra for different yrs cars ?? I don't have a place to plug this in and my old piece didn't have the extra wires on blonkbl assembly??