Concealed 3-Way Thermostatic Valve Shower Mixer Round Knobs 5-3/8'' Wide in Brushed Nickel or Polished Chrome by Alfi brand | KitchenSource.com
Shower Knobs 3 Piece for Repair Kit Compatible with Price Pfister Verve 3 Handle | eBay
Pfister Part # LG01-1120 - Pfister 3- Spray 3-Handle Tub And Shower Faucet With Metal Knobs In Polished Chrome (Valve Included) - Tub & Shower Faucet Sets - Home Depot Pro