Just a word of caution... I put the aftermarket 7" housings in my 67 about 5 years ago.
Yes the wire connector for these fancy little bulbs is different and yes you will need to upgrade the wiring with relays or you will fry the stock headlight switch. that switch and the wiring going to the original sealed beams is not adequate for the amount of current these little bulbs will draw.
Now for a unforeseen issue... The original sealed beam is not as deep as the aftermarket assemblies so it fits in the headlight house with no problem.
The aftermarket fixtures you purchase may be so deep that they crush the wiring behind the bulb against the headlight house.
While this scenario hasn't happened on my car yet, I do predict that the wire insulation will chaff against the sheet metal and create a short circuit eventually.
In a more perfect world we could simply cut away a portion of the headlight house sheet metal and gain the ability to replace a bulb from under the hood like some modern vehicles. Not gonna happen with these Chryslers. Cutting an opening in this headlight house will only expose the fixture to the wheel well and we don't want to do that.