Back-up lights

[Goatnut]

My '64 did not come with factory installed backup lights. Were these an option? I've seen them on other trtucks even earlier years. I'm curious to learn more about them.

I'm not sure it is all that important to me to have the correct lights especially beings I would probably have to put a toggle in to make them work (not sure if trans is equip'd with a backup/reverse switch to power the lights. I like the look of the single 4" spot as an alternative. I was wondering if anyone has examples or other suggestions.