Come to think of it, I'd like to have those heads, but instead of the Jap logo, then have my own initials cast and painted.
Or, maybe just get the original S&S covers in "wrinkle black" as SS calls them. Easier and looks "the part", because they are the part.
And that, I think, would be the icing on the cake. Bugger the retro look, get some original thinking going..