Jim,
I had gotten some of those very tubes in the 1990s. I didn't use them until I (tried) to calibrate my 547 a few years ago and found them a little less than wonderful than actual 6DJ8s to the point that I wondered if they were even related to 6DJ8s. They didn't always work well in place of 6DJ8s. I hope you have better luck with yours.
(As I have only 1A1 plug-ins, I can't help you with the chassis rods.)
PMF