A very promising new contender has arisen:
Recardo - PODIUM
https://www.recaro-automotive.com/en.../recaro-podium
Brochure:
https://www.recaro-automotive.com/fi...-podium-en.pdf
It looks absolutely wicked. M and L sizes available but no exact dimensions listed.
The way the harness holes are positioned on the spine is very encouraging since it looks like the top most set is higher relative to the shoulders than the SPG XL
So if this is just the same size the SPG XL with higher holes . . . its perfect