I just picked up a Rock Island no574 for $25 and took note that the back jaw was missing in action, apparently screws snapped back in the day from a wild smasher, I have done the Google thing but either the reproduction pieces were sold out or website shut down....if I to try and get one made I...
I am definitely looking for new jaw as my rear one is broken off at the screw's and missing in action, but this site is down and the site I found is sold out....looks like a trip to my favorite machinist