Seat base : 342mm at widest point
Seat lid : 357mm at widest point
 
This seat and cover comes with C4501H stainless steel top-fix hinges as standard
C4501H Hinge centres to front rim adjustment : 396 - 417mm  and  433 - 454mm
 
with Adjustable top-fixing hinges, hinge centres to front rim adjustment : 399.4 - 448.4mm 
 
Other colours may be ordered and re-coated to special order. Price on application