It is indeed a beautiful car. I think in the listing it was verified that someone added the 'Virginian' scripts to it so it is a '51 but a deluxe model. We once had a '51 Henry J that someone put a continental kit on, then added 'Vagabond' scripts to it but, like the Virginians, all Henry J Vagabonds are '52s by factory definition / designation.
We also sold a modified '51 Frazer 4 door sedan which the new state titled as a '51 Frazer Manhattan, all of which were hard tops or convertibles by factory definition so there's some exceptions out there now.
I have Edgar Kaiser's Henry J which is tagged and titled as a '51 but it's clearly a '53 so it can get confusing!
But getting back to your original inquiry, the part you need is the same for '51 - '55 Kaiser and I believe the same for the Henry J.
Forum user pnw_oldmags has most of the KF Parts manuals online so you can look and verify there.
http://circlekf.com/sourceslider.php?sid=12067&dp=pa&yr=all&mk=all®=all&cls=all&typ=PM&mg=all&pub=KF&nbr=550&modID=none&srcID=645&pag=000&action=go
I'll have a look at my spare parts too - I may have one.