Schneider Electric Harmony XB4 ON/OFF Illuminated Push Button Switch, Metal, Green Flush Marked I, Red Projecting O, 1NO + 1NC, 24V AC/DC, 22mm Mount, XB4BW73731B5

Amazon

Complete illuminated double-headed push-button with chromium plated metal bezel Spring return operator 24 V AC/DC, 50/60 Hz rated supply voltage 1 NO + 1 NC contact configuration Screw clamp terminal connections

Zoro Tools

Two flush head for double-headed push button. 22mm mounting diameter. With "I/O" marking. Spring return.