you'll need side mount brackets for the seat (unless it is a bottom mount, but probably not) which are typically seat specific so check with your seat vendor. then you'll need something to attach the side mount brackets to the floor. depending on width of the seat you can use one of these:
http://www.bkauto.com/category_s/121.htm
otherwise something more universal like this:
http://www.statusracing.com/catalog/p132619/Planted-Driver-Seat-Bracket-Porsche-Boxster/Cayman-96+-/product_info.html
uncertain if you want sliders? they will add a couple of inches to the whole assembly. depending on width you may be able to use your oem sliders (with the bk floor mount bracket above) otherwise a universal set from the same vendor as the universal floor mount bracket.
otherwise, typically the side mount bracket will have a provision for attaching your seatbelt receptacle so all good there (the hardware is universal so everything should bolt up). depending on year of your car you may have an airbag sensor in the seat which would require a computer to deactivate otherwise cel.