Hi tryals15, just FYI: Your Speed is pre-1955 (side rangefinder); the Crown is post-1955 (top rangefinder). I was mystified by the 3 types of Graflex and Graphic backs till I found this good explanation, complete with illustrations:
http://lommen9.home.xs4all.nl/holders/index.html
Your Crown definitely has the Graflok back which looks to be in good complete shape, so I assume it's the Speed that has the broken rail braces. You didn't include a picture of the back on the Speed, so I can't tell if it has the Graphic, or spring, back (pre-1951) or the Graflok back (post-1951). Probably the Graflok back, since the spring back doesn't have what I'd call rail braces.
I've been using Graphic press and Graflex SLR cameras for years and really like them. The people on the Graflex site were happy to help me out when I started. I recommend a visit:
http://www.graflex.org/
One member, 45pss, is a technical expert and has contributed more than 1000 posts. I'm sure he could give you some advice re those broken braces.