Vitra Dual Push Button for Optima 49 Mechanically Operated U34494907
Vitra Chrome Push button ONLY 429490 compatable with flush valve 429474
Vitra Flush Valve Including Button Replacement Flushing Mechanism, Single Flush Valve and Button Toilet Cistern Flush Single Flush Valve with 2 inch Flush Valve for 2 Piece Toilets with top button - Walmart.com
Vitra Toilet Push Button Dual Flush made by Geberit | eBay