Can anyone suggest any ideas on how to do this?

So there is this server I play on, it has signs which sell guns on them (look below)
I'm wondering how I can do that because the part with a lot of numbers and hashtags ect is the ID I'm looking for so I can put my guns on admin shop signs, does anyone know the plugin I can use to find this ID?

 

Not what I'm after, so that they fit in with my server I need to get them on the signs like in the screenshots.

 

That wont work.