Blinkers and Hazzards

First find out if the system works. Get standard bulbs in there and make sure everything works right. This will show the sockets, wiring, connections and TS switch all work. Then deal with LEDs Some LEDs are different and a PITA. Some require special flashers. There is so much China garbage out there there is no way to really advise you on this.

Someone needs to, or maybe they have, come up with a good electronic flasher that is independent of load

Also TELL US WHAT YOU ARE WORKING ON. Year make model

Early A's used what amounts to an add on hazard system, 67-69 used a switch external to the TS switch, and all column ignition cars had the hazard switch built into the TS switch, so yeh, it DOES matter