Are any close up photos of mine, any use to you?
I rode around Australia on my original ST1300 seat, fitted with an Air Hawk set pad.
This was quite good, comfort wise, but a bit fiddly to get just in the right place, and with the right pressure.
My "2nd hand replacement" (insurance job due to damage caused by third party) ST1300 came with a Sargent seat. It is definitely better than the bare original seat.
I have tried using the Air Hawk pad on the Sargent seat, but with me being 6'2"+ my knees/shins tend to touch the fairing, due to the redesigned seat profile making me lower and further forward, compared to the original.
For comfort and convenience, I use the Sargent seat (by itself) all the time now.
(My wife much prefers the Sargent pillion seat, to the original, too)
Regards
John