The knobs from...
http://shop.conrad.be/componenten/componenten-passief/knoppen/toestelknoppen/717619.html
The push buttons from...
http://www.ohmeron.com/content/index.php?page=products&id=20070305181847932&sg=20070228143905846&lang=EN
http://www.ohmeron.com/content/index.php?page=products&id=20070305184412874&sg=20070228143905846&lang=EN