Here are a couple of pics of mine (the too-long bolt in the axle-end mount has been replaced, by the way!). I, too, went with captured nuts (1/2" NF) inside the brackets, fully welded around their bases, at both ends. Note that the axle end of the panhard rod is angled to meet the mount properly. At the other end, it's straight, as the mount itself was able to be welded in at an appropriate angle. The whole thing has been cleaned up & painted since these pics were taken. All bolts are Grade 8 1/2" NF.
Attachment:
panhard at axle small.jpg
Attachment:
panhard at frame small.jpg
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Scratch building, at continental-drift speed, a custom McSoreley-design framed, dual-Weber 45DCOE carburated, Zetec-engined, ridiculously fast money pit.
http://zetec7.webs.com/