Seat for Kohler Champlain K-3390EB | This Old Toilet
Kohler K-4713-RL-0 White French Curve Elongated Closed-Front Toilet Seat with Soft Close and Quick Release - Faucet.com
Kohler K-1381-HC-28362-0 White Veil One-Piece Elongated Dual-Flush Toilet with Hidden Cord Design - Includes Irvine E915 Bidet Toilet Seat with Remote Control - FaucetDirect.com