They look to be the same as the LED's I have. I ran the wire to the base under the rubber seal, rather than cutting a slit in it, but I just noticed the Cyclops bulbs in the link that LindsayGT posted on the first page seem to have all the wiring going in to the fan unit, so there would be no need to have to fiddle around with the rubber seal and getting a wire through the hole in it or underneath it.
The cyclops link also has an option to tick if an ST1300, so I assume that means that it is a PX43T base as SAAZ mentioned earlier as well. So if that's the case, no need to trim any tabs, not that doing that is difficult.
I guess that you'd just have to weigh up the advantages of not having to slit the rubber seal, as opposed to maybe the extra cost of the Cyclops one, but after fitting mine and fiddling around with the regulator thingy and then the rubber seals, the Cyclops ones might be easier to fit. At least the video they have of the units being dunked in a glass of water allay my fears of the fan unit being a potential trouble point.
I, like SAAZ, seem to have a very smooth beam, and whilst I haven't been on an extended run with them, I'm very happy with the light output and the fact that there are no "artifacts" in the beam that worry me. There is a very straight line at the cutoff point on the low beam so against oncoming traffic, you can see where your beam is in relation to their head height. Makes the headlight adjuster very convenient.
Anyone tried the Cyclops ones??