I'm sure they don't come with rails.

I don't know why you want to cheap out when real Sparco Sprint seats are about $220 each. A lot of the cheaper brands use weak fabrics that can wear through pretty easily... I'd recommend stock (junkyard) replacements before them.

Remember that age-old saying, "you get what you pay for."

Hell, I'm looking into some Kirkey seats myself... but that's another story (Yes, I am just that crazy.)