Would it not be fairly easy to grind thru the crack, weld it back up, then get a piece of heavy wall tubing to duplicate the new cross brace and sell it to someone in need of a souped up cross brace? That may help someone out that doesn't have the skills to do so and take theirs in exchange and do it again.
It wouldn't be too hard to enhance the original design brace. But after having both in my hands now and examining them up close, the new design is nearly twice the metal thickness and more generous all around. Certainly the bottom is where they break, and it could be beefed up without a whole lot of effort if someone had a nice welder, and the knowledge to use it.
For the price of shipping I'll send my old brace to someone who wants to experiment with it.
The old part to new part is a whole other level. While looking at them it occurred to me they tried to design this brace for a homeowner mower, it broke, so they just threw the fasttrack part at it.
old vs new:
I still think those welds are the weak point and could have been done much better. The weak point on this beefy part may be plenty strong to last forever, time will tell.