Mustang 08-21 Harley Electra Glide Std,Rd Glide,Rd King,Str Glide Touring Solo Seat - BlackMustang's "Super" comfortable 17" wide solo sits the driver 1. 25" further back than the stock seat and is available with or without a fully adjustable and easily removable driver backrest. Pair with an 8. 5" or 11" passenger seat, or a recessed 13. 5" passenger seat for comfortable 2 up riding. Recessed passenger seats are required for use with the available built in driver backrest, while regular passenger seats extend forward for additional rider