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Corbin seems to still make them...
https://corbin.com/bmw/9596r1100r.shtml
As does Sargent.....
https://www.sargentcycle.com/Seats-Accessories/BMW-R1100RS-R1150RS-Reg-Heat/
......I see that the Seargant is a custom seat and a $1000 is bit to pricey for me. I only paid $1500 for the bike, I’d hate to sink almost that much in a seat.