Renovator's Supply Polyresin Bathroom Toilet Seat Sea Shell Adjustable Elongated Hinge Browse Toilet Seat options of all kinds. Click to view Toilet Seat sizes. Check out our Toilet Seats NOW. Fun toilet seats made of High Grade Polymer for durability. Does NOT yellow like most polymers Seat 16 7/8 x 14 1/2 Lid 16 1/8 x 13 3/8 inch Oval hinges fit standard 5 1/2 in. hole spacing Adjustable but not recommended for adjusting on standard US toilets