Had them at one point. I used the Recaro sliders on Planted Brackets, fit was perfect. Sold them for a custom set of Recaro LSD's as I preferred the look and fit of the LSD in my car.
Thanks for that info, great to know you liked the height of that setup. Seems the popular options are Planted as you described, and Wedge slider mounts. I contacted Wedge, and they did mention 3/4” spacers were required for contoured bottoms of the Sportster seats.