Have received, and installed the LED from classiccarleds...
And I'm super impressed. The instant-on when flashing main beam is brilliant, and the intensity of the light is great. Best of all, though, the warm colour means it doesn't have that 'modern' effect of the usual bright white LED. Still looks old-school.
It was a bit of a wiggle to get it all in place, and I did have to reverse the heat-sink into its shorter setting. And it definitely wouldn't have worked without the wider rim. But, if anything, it just forced me to give some attention to the wiring in there, and neaten it up a bit.
Overall, very VERY happy. Will send some pictures up when I get an opportunity for a night-time photo shoot.