So here are some pics of the TIR and triple mod. In both cases I left the stock driver alone, 2.1 amps on turbo is plenty for me compared to grafting in another driver with the e-switch.
The black O-ring is a 18mm x 1.5mm and the TIR is the standard convoy TIR. The green O-ring is a skinny 20mm x 1mm that fits in the groove around the TIR edge and the Bezel tightens up against this fairly well. It is splash proof at the least. The lower black O-ring is to center the TIR, it seems to keep everything stable when the bezel is tightened down. It is not essential, but very helpful. No modifications are needed to the driver/LED carrier. I put a light bevel on the back of the driver ring to help with reinserting the carrier, but will show a pic of that later.
This is the triple set up. Stock O-ring fits like a charm. Carrier needs shortening and Noctigon needs filing down, that is it.
I took 2mm off the front threaded area of the driver/LED carrier. I went slowly with a piece of 120 grit sandpaper, and touched it up with a file. The Noctigon is filed down and the void left on top of the driver shelf filled with Duct Seal to make it solid and hold the MCPCB (Duct Seal is sticky). There is plenty of wire for this on the stock driver, but if you want to replace the stock wires, they are in easy to get to spots for soldering on 22awg silicon like I did. The good thing about having some room above the shelf was that the wires were just left in the holes on the sides like for a regular single LED, and just brought up through the middle of the Noctigon, no holes drilled!
Also note the bevel (crappy as it may be) to help with reinserting the carrier into the body, this lets the silicone button cover tit ride up and not get pinched/pulled off.
How far I had to file the Noctigon down. Just go slow and easy, it takes a bit. It should be right at the size of the carrier diameter when you are done. In the middle with the wires, you can see the Duct Seal that I used to fill the void and hold the wires under the MCPCB, this also helps to "stick" the Noctigon in place during insertion back into the body.
Just a side by side from the unmodified carrier, to the triple carrier. The optic on the triple does not need to be sanded as the body is slightly larger toward the front. I lightly sanded the edge of mine to get it in and out past the bezel threads easier.
Some front end shots, forgot the battery in the stock light on the left...
Hope this helps someone that wants to do either of these mods, the triple is easy and using the stock driver may not increase the output much, but it still looks good to me and you can pick your tint...