Swing Top Beer Bottles

Remember the old glass bottles of RC Cola came in a pack? (Or was it 8?) Anyway, my father used to drink and he used these these peaks that are attached to the upper neck of the bottle and the bottle has to be open and closed, as are bottles of Grolsch beer or a bottle top EZ. I'm looking to the Internet for bottle stoppers and I find nothing, but maybe just because I do not know the name. Can you help me?

Grolsch!

That's what they are called today, the bottle cap EZ.
Here's a site that I use for my cordials (flavored vodka I). They are cheap here!
http://www.midwestsupplies.com/products/ ...