I received the Evitek LED headlamps in 2 days from Amazon and they are in on my '01 ST1100 ABSII. They are way better than stock and better than the 65/55W I had in there. These are the basic steps I took...
1. Remove ABS computer.
2. Remove the lower triangular plastic. Makes it possible to come up through the bottom as well.
3. Remove the rubber boots and old bulbs
4. Twist out the new LED bulbs from their holder, cut the tabs on the holder and install the shims.
5. Install the new holder with shim (without LED bulb) and lock the bail.
6. Install the boot, being careful to fully seat the center of the boot around the gray plastic cylinder of the new holder.
7. Install the new bulb (bayonet style, insert and twist).
8. Make wire connections and tidy up wires.
9. Reassemble all the plastics.
10. Go ride!
Here's a few pics of the install.
The ABS computer needs to be unbolted. I left the wires connected and moved it around as necessary.
This is a shot of the LED holder installed without the bulb. I cut the two lower tabs and installed the shims so all three tabs fit.
This is the same shot with the rubber boot installed. The boot center fits snugly over the bulb holder. I pushed it all the way down over the holder, which is the gray part in the center.
The biggest issue was the same issue Dean mentioned... the bail pushes against the fan housing, just a little bit. It actually cocks the whole assembly a few degrees. I took this picture without the boot to show the interference between the bail and the fan housing.
I don't know if the cocked bulb makes a difference. I played with it against my garage wall and the pattern moved a little when I pushed it around but not sure if it's enough to notice. Overall, I am very pleased with my new, better headlight.
Hope this helps other ST11 owners.