Show me the restrictor

again thanks you guy's really came through. I just didn't want to get the wrong stuff. I will be ordering a new dual port master cylinder that's drum /disc and the adjustable prop valve. now I've been looking at lines for the dart and suspect that I can order 73 and up dart hard lines to fit? since it's going to be a 73 master cylinder I'm ordering
rubber lines have to be adapted since I'm using scarebirds setup on one car and have the 73-up uca and spindles for the other

thanks for the info