The plugin is calles Scroll Triggered Boxes, and here is the code within mine.
I guess you would need to have a page name rather than page id?
<center><iframe style="border: none; overflow: hidden; width: 234px; height: 290px;" src="//www.facebook.com/plugins/likebox.php?href=https%3A%2F%2Fwww.facebook.com%2Fshakescocktailbar&width=234&height=290&colorscheme=light&show_faces=true&header=false&stream=false&show_border=true&appId=570664269654516" width="300" height="150" frameborder="0" scrolling="no"></iframe></center>
Thats mine, just change the “shakescocktailbar” with your page name, it should work.
Matt