you can look what consist the system on these sale ads:

Ad from FBBO

Ad from eBay

and this is the diagram for 71s, which gets more parts involved but you can isolate the info for the ign key light section, specifically related to the time delay flasher.

Flasher is still available on Mopar dealers since was extendely used up to XJ jeeps ( maybe even some others ) on $17-22 rate, but it can be found as a replacement on $5-10 in an aftermarket replacement brand which I can't recall right now