Following, I am interested in this as well.

I found this on shapeways and may pull the trigger on one. I bought a varia mount for my Madone and it was a quick turnaround

https://www.shapeways.com/...4&li=marketplace

Cool. What type of light will fit that mount?

Not sure, I was planning on using it more for mounting my garmin and possibly a GoPro. Here is what’s listed in the description
On the bottom of the clamp is a Blendr mount that will allow her to use her Ion headlight or other GoPro style accesories.

I use this light from Light & Motion. I can strap to the ski bend extension and rotate it to shine straight forward. Simple and effective.

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Toro Performance

^^^^^

That’s the correct answer right there.

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"When the going gets weird, the weird turn pro."
Hunter S. Thompson

I use the Ion Mounted on the bottom of the mono extension on my left side so it points into oncoming traffic. Works fine for me

This. Ion under the aerobar.

I have used the bontrager ION 800 under aero bar with the rubber strap that rotates, and it works great. I think they have replaced that light though, and not sure about the new version.

The Barfly 4 TT has mounting options for lights under the head unit. Works great with the Garmin Light.

https://www.amazon.com/...gellan/dp/B01GRHYTBK