Mark, these are for the cars that have hydraulic brakelight switches. The first one is for the early cars with the screw on terminals, and the other one is for later models that used spade connectors at the switch. Your '75 should have the push type switch on the front of the pedal box. They started using that when they went to the dual circuit brake setup in about '68.
Either of these switches would work, if you plumbed and wired them into the system.
Jeff