I am looking into getting the sparco evo seat and was curious on mounting them. I know a few people are here have them and was curious on you mounting them to the floor. My understanding is that they are side mount seats. Those who have mounted a fixed seat with side mounts, did you have to drill new holes through the floor or did the mounts line up.

 

I got the sparco evo 2 and it's mounted with sparco base and side mounts. I did modify the base a little (read drill 2 new holes) for the side mounts to use the very bottom position for the seat.