If you don't cut the bottom of the boot off when soldering the leads then the contacts even if removed makes pushing the LED down far enough into the socket more difficult further stressing the soldered wires. I personally think the WLED is the wrong LED for any of the indicators as it is too powerful....distractingly so. The #74 tri-power is perfect for both neutral and turn signal indicator...very bright but not like a laser beam as with the WLED which also doesn't fit as well into the socket, solder or no solder. I had a WLED bi-polar LED in the turn signal position and it was simply too bright. That is when I wired in diodes so I could use a more conventional #74 Tri Power which is a smaller polar LED as you know.I can send you a boot if you really want one. It might not be the "neutral boot", but they're all the same.
You don't have to cut the bottom off the boot to solder the wires. Just slide the boot down the wires, cut off the offending bits, and solder away. Remember to put on the heat-shrink tubing and slide it away from the heat before you start soldering.
I think that if you're going to be in there soldering anyway, as you would if installing a new boot, you might as well just solder in a WLEDx6, although the soldering will be bit more finicky. When it's done, it's done, and you won't be able to see the difference.
Balto - do you have a boot with the clips intact? That would be preferable as my soldering skills are not that great...