I had Hartco custom build me a seat for my 2015 F6B and they got it right the first time and it fit me perfectly! Now moving up to the 2019 Goldwing Tour trike I only made one phone call for a custom seat,... Hartco! I'm 6'4" tall and right at 295lbs and while the stock fits good it could be better with me needing to be moved back as far as the seat will allow. Talking with Hartco he told me "I know exactly wat you need" and they got it perfect again. I chose not to change the passenger backrest at this time but he blended the two so it looks great. I also opted for no heat and their seats include the "dummy plug" for the heat connection so there is no dash light on. Here's some pics of the stock seat next to the Hartco and one showing the bottom custom fiberglass pan they make and a couple on the trike. Inside so pictures are not the best.