Mine are fog lights off some old Volvo. I paid $5 or $6 for the pair at a junkyard. They take the removable H3 bulbs. They were a direct bolt in, the glass locating nubbins were in the right spot, mounting depth was the same as stock, no difference except for the electrical connector, I was able to use to little "jumper" wires to plug into the stock Chrysler connector.
I'll be replacing them soon with aircraft landing lights, I don't get enough fog to need fog lights where I'm at in California.
Consider doing the headlight relay upgrade, the voltage drop at the head lights is pretty bad in these 38 year old cars!!