jkeith.w
Official Vendor
If I can find a used axle housing laying around I'll cut one off of that. If not I'll make a new one from scratch.
The other side will get re-enforced with 1/4" plate on all sides. The way this failure occurred I'm pretty sure plate on the sides would prevent it but I'll also plate the back just to be sure.
I can send you one after I prototype a reinforcement on my spare axle (cutting it off to prep for 4-link)
I'd encourage you to stay 3-link, though - with the proper links and a reinforced mount, I think you'll be golden - why add binding into the mix by running the driver's upper link?