MEC switches are available at Reichelt: https://www.reichelt.de/multimec-button-no-lights-print-connection-taster-3fth9-p156904.html?r=1 or Conrad: https://www.conrad.de/de/mec-3fth9-drucktaster-25-vdc-005-a-1-x-ausein-ip67-tastend-1-st-705268.html   TBD62381A is available at Digikey: https://www.digikey.com/products/en?keywords=TBD62381AFWGELCT-ND%09 an alternative part is TBD62083AFWG, with good amounts of stock listed at Mouser (the flyback diodes shouldn't affect the oper