You can get the housings from a Liberty and they take a H4 bulb I believe. Then you can go LED, halogen, or what ever. I have LEDs in my 72 and I need to get less bright ones. They are over kill for on coming traffic. I have used HID's with diffuser housings but the ballasts crap out and make it no fun. I've heard guys having good luck with these:

https://vintagecarleds.com/7-inch-ro...SAAEgKFCPD_BwE

I had these in the 40 and they were a big improvement over a regular halogen lamp.

https://www.walmart.com/ip/SYLVANIA-...&wl13=&veh=sem