GCR page ITCS-10
Section 5. c. 1.

Any anti-roll bar, traction bar, panhard rod or watts linkage may be added or substituted, provided its/their installation serves no other purpose. The mounts for these devices may be welded or bolted to the structure of the vehicle.

There's some more about not mounting it in the trunk and that the bars should be solid tube and heim rod ends can be added, etc...

My stock mount is all bent up, split and overall not very sturdy. I'm looking at three options. 1.) Weld in some sheet metal to reinforce the split panhard mount. 2.) Cut the stock mount out and weld in a new stock mount from my parts car. 3.) Build a new mount like the photo from my above post.

My interpretation of the GCR says that #3 is legal. I guess I had better ask the tech guy from my region before I get knee deep in work.