The ignition switch connector seems to have 6/7 contact receptacles. The New switch has 5. Only 4 or 5 are used. If the new switch fits onto the connector you show, you are half way there. There seems to be no other switch available to fit that connector and utilize it's locking tabs other than possibly a 67-72 era switch.
How many wires are coming off your connector from how many contacts?
Does the new switch fit onto the connector even though 2 contacts are not used?
If it does not, we can move to plan B and C. Not a serious problem.
There is a 67 68 69 Car switch known as 1116658 or
This. It has the 7 blades and 3 locking tab/keying tab receivers for your connector. I have no idea if it fits your dash hole and bezel.