70 key in buzzers are one year only piece, being triggered by positive. Since 71 was changed to a negative source.

70s also worked as a lights on buzzer adding a diode on the circuit. Harness get a plug provision for that.

Usually the difference between bodies buzzers is just the bracket shape, but the inners uses to be the same, so if you need a replacement and can't find the exact piece, you could change the inner gutters from one housing coming from a diff body to the exitant on your car. Piece of cake.