[ward]

Way back in the eighties when I had a Darmah, I fitted a small rack off a BMW K-series on the ducktail. It wasn't huge but it allowed me to carry stuff and tie it down and so on. Don't know if that helps, but maybe a wrecker has an old K?

 

[ward]

My gut tells me that it was bolted through the fibreglass. (Though my heart wonders how I could have done such an insensitive thing to the Darmah!! - Youth?)

There were (fading recollection) four 'posts' that protruded from under the rack that sat on the ducktail. I don't think that there was any other way to get it attached. It was almost exactly the same size as the 'flat bit' on the Ducktail itself, which is why I used it.

If there's a wrecker near you they might have an old 'K' with one one...

 

[ward]

Or get a replica replacement tail and drill it?