bmw gsa rider's single seat
 

hi,
i am using a sargent single seat for my gsa. my topbox is now placed on the pillion space.

there's a gap between the rider's seat and the topbox, can anyone suggest where i can find a cushion to cover this gap or is there a backrest to fit this gap?

i hope my brief expalanation is clear for all to help me here with your suggesstion.

thanks.