I've installed light weight racing buckets using the factory floor guides and making some adapter plates to them.. works perfectly. For seat choices, I suggest that you try to sit in different brands, models, etc.. so to see what "fits you"... like trying gloves, shoes, etc. Some seats offered through the aftermarket (Corbue, Sparco, etc.. so many different kinds and price ranges!!!) will be offered in different widths.. standard, med, large, x-large.... makes a huge difference in "fit"to your personal frame. i have a Corbuo GT8 that fits me like a glove for racing; I also have a pair of JC Whitney GaragePro performance reclining seats (looks like expensive Recaro's, etc) but they fit me well, high side bolster, reclining.. and on the lighter weight side.