For sale: A used, but perfect condition, RT LC high rider seat. Fits R1200RTLC and R1250RTLC, all years, 2014 to present.
It's about 20mm higher than the standard seat. Eases the angle of your knees.
Heated, black in colour. Thicker cushioning than the standard seat.
Genuine BMW accessory.
BMW part number 52538544792.
Price £165. I'll cover postage to a UK address.