These resin replacement seats have 2 separate hinges, but are specially manufactured to suit the Sottini Reprise model. 
 
PLEASE NOTE :   "BOTTOM-FIX" HINGES ARE NOT SUITABLE FOR "BACK TO WALL" REPRISE TOILET PANS, AS THE PAN WOULD NEED TAKING OUT TO FIT THE SEAT.
 
TOP-FIXING HINGE OPTIONS ARE SUITABLE FOR ANY SOTTINI REPRISE MODEL.
 
These seats are not compatible with an original Sottini Reprise hinge set. All the fixings you need to fit the seat to your pan are included.