I looked on Ebay - there were some close calls but no matches.
Update 3/31: I called Moyers and they actually had a Thordarson yoke.
and the right VDR.
Update 4/1: Yoke appears at back door with VDR in a NAP bag, that was quick
Update 4/2: Install later tonight - fingers crossed.
Update 4/3:
Total success with the yoke, 24-27 kV range, perfect drive waveform to the 6LR6 grid - pictures will follow once I get my Sencore VA-48 connected.