I had to modify a set of non-SVT seat brackets (non-electric) to mount my Sparco's you need to drill out the rivets that attch to the seat base and then fab up some plates to weld to the brackets. Then you can screw in the seats onto the stock bracket. So I have the stock sliding mechanism and stock seat belt mounts. It's a little bit of fab work involved as the "drop-in" seat brackets are $$$$$$$$.
I have a set of new universal seat brackets for two seats if you want, that I didn't use, if you want to take the easy way out though.
