Dave,there is a "hole" in which the alignment post mates. I will tke pics next time I am at the factory. The race type seats are an option from DRB. If you email Peter Ransom,
peter@drbsportscars.com I am sure he will be happy to supply specs,upholstory options and quote prices. As soon as mine arrive I will post pics.If you want the seats mounted on rails the floor pan needs to be modified to make room. Peter can supply details.